Malicious PDF — malware analysis report

Static analysis result for SHA-256 7923c853079f202b…

MALICIOUS

PDF

42.9 KB Created: 2020-10-28 03:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b4d904d246bde3fcc3ab326b28b4a632 SHA-1: 1dbb431222cf60fea5e08ea3dc42b5f8db8d1ae6 SHA-256: 7923c853079f202bfcd2a0a0fdebd305336034424664679c5b7b08de15723234
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://ggtraff.ru/strik?keyword=jamie+eason+phase+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f92fde5e61f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f9753d6b95fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5f989d519ee71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f8fdc8411f7e.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/kirebamupabew.pdfIn PDF document text
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/d98de1e087554d.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/viwiwogobadivid.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/8665695.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/a46951a9ae7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f8f727592144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f91c075d4f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f89171f8493b.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/234b2c5b-bc14-4bca-aaa3-9680f90fd0d7/storm_school_spells.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca9fa73-04a8-47a0-9e48-c0155b5dd9ed/box_turtle_prey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae569d47-4dff-4425-8e82-7201c488e6d6/pazeligemigatotafafose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8775/5432/files/99427161335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2879/1463/files/wekaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2658/6527/files/i_never_sang_for_my_father_script.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/70717714169.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/korean_alphabet_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gunolorukuvigeramifeju.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A4 5196 bytes
SHA-256: d44f334c6728a879df1dd169b8943b63cc6f0e1136a9868580d9b1451660959b
font_01_sfnt_off0000782c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782C 11264 bytes
SHA-256: ea6f351d6b6e3c8d2ba553b4b688565acde25f06b8e3e58b26fac252ec6069f4

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