Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e94699fde4f2507…

MALICIOUS

PDF

44.7 KB Created: 2020-10-12 12:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9216d15985dd0b1f20e5f35fceb63060 SHA-1: 9eab7a6fc0ef4d004f736e7c1d2330f77cc12bfe SHA-256: 1e94699fde4f25079be4307d6039efdfbf9aa045ffd6fe23111748f20fcf9dcd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a specific redirector URL designed to lure users into downloading a game. The ML classifier and heuristics strongly indicate malicious intent, likely to lead users to malicious infrastructure or malware. The document body, though heavily corrupted, contains the redirector URL and a keyword suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/pify?keyword=car+race+game+download+for+android+mobile In PDF document text
    • http://welozozi.moniquekgaffney.com/uploads/1/3/0/7/130739779/6670724.pdfIn PDF document text
    • http://mofimare.hkmusichall.com/uploads/1/3/1/4/131409090/sonenoditav.pdfIn PDF document text
    • http://files.la-perlablanca.com/uploads/1/3/0/7/130740050/mekese-zoxid.pdfIn PDF document text
    • http://mawumoku.atpsportsnutrition.com/uploads/1/3/1/4/131407181/5112521.pdfIn PDF document text
    • http://files.sprocket-theatre.com/uploads/1/3/1/4/131482944/89b084f.pdfIn PDF document text
    • http://xuvawu.abackrubco.com/uploads/1/3/2/3/132302987/gulonato-poluwupodosagel.pdfIn PDF document text
    • http://files.staceylynnsworkshop.com/uploads/1/3/1/3/131380467/9940469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06b956f-98d2-41be-84f2-bf4d841962f9/paxiwizerupukarupob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efc1c8f-9797-43cc-a262-2e018b23f6c1/pikedomenivumegejurax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0745722e-c387-4d6f-a8f4-4a9004379ad1/89940375894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004c45bd-0c79-4167-9626-fd53684efbcd/xofuvexati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9934/0448/files/skyrim_more_npcs_in_cities.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71AA 5300 bytes
SHA-256: d15a0b06779a678879df31133de272e2db3f2fb1c72c7c4c23aa8352eb500b0e
font_01_sfnt_off000083ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AB 10044 bytes
SHA-256: 7284421e6d19c0095cf7f5b14d357e4f5df680f4fa258548fef8e934179ad48e

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