Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d1823d4b41ac65…

MALICIOUS

PDF

49.5 KB Created: 2020-10-27 20:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 45525dec2d81a77068f16aca2ebe03c1 SHA-1: 8019c634d560f6a0b9b1c3353d27abf5655afae3 SHA-256: e2d1823d4b41ac657f66820a97a4c005db30660a1f033bdd609c864bf2aafc41
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, designed to lead users to other sites. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/123?keyword=arts+of+the+contact+zone+pdf In PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/4cefac5a.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/novikipanefi_vodunibuxez_tixowugivanigis.pdfIn PDF document text
    • https://wilewefat.weebly.com/uploads/1/3/4/2/134234777/351b3f0efc1.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/1dde2a6f86e43f.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/70fda9f5.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/redadidafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e3f27428-ace5-4d18-903a-4c41b66ffe17/95847041599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb87a546-f673-4212-b8cf-aec386c14c48/52718993495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83551365-74a7-4fba-9129-aecec0bf0844/82542466515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b022126b-c1be-44e2-b5bd-f5e92bdef4f6/66826085640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/dd_adventurers_league_character_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/doki_doki_literature_club_natsuki_plush.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4947/4971/files/ronove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/meridian_59_leveling_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8613/8532/files/la_rutina_diaria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7292/8920/files/mcphs_academic_calendar_2020-21.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/pedagisagaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2501/4173/files/16583132994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849e6034-3173-4628-8b6e-dc3d72e5c808/66263750678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8040fc-b3e0-4e4e-9fae-ef57f5e0a64c/jemaxivixisog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6a9cc1-b2c7-4894-b53a-5d68ef8d9f6e/562993956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86b7d7d-78ba-4717-8695-594336093dfa/74266629464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8b3c59-750c-4f35-ac0a-50541958dec5/senoxavikedobisujiwufo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7347 4992 bytes
SHA-256: 657f0fe35f7103b31c2b515e07121d0352f01d07781b196d3863345e41bd05d7
font_01_sfnt_off00008438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 11188 bytes
SHA-256: 20884f6e3e8ab66122d48cae7a78bc19311fd3f30edf151b2b4f3abc57fff8f6
font_02_sfnt_off0000aa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA04 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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