Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c767ceb4cff6f0a…

MALICIOUS

PDF

73.1 KB Created: 2021-01-17 18:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 51f10b8766e90adbae17acfff90d3337 SHA-1: 5449964f8f742491fdf1c2d4daaf714e46d1bbbf SHA-256: 3c767ceb4cff6f0a5416982a40d7ddf928a24284903f51ed7179fcb96856ce60
86 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to a potential application download disguised with terms like 'black ops zombies apk mod menu'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a malicious intent to distribute malware or phish users. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=black+ops+zombies+apk+mod+menu PDF link annotation
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/575d6950ce6.pdfIn PDF document text
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/e14726237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fbebcf26faec.pdfIn PDF document text
    • http://zozuwax.66ghz.com/senran_kagura_shinovi_versus_achievement_guide.pdfIn PDF document text
    • https://site-1177929.mozfiles.com/files/1177929/guilty_gear_strive_ps5_upgrade.pdfIn PDF document text
    • https://mukiniga.weebly.com/uploads/1/3/4/3/134318698/kugavatuji.pdfIn PDF document text
    • https://site-1173562.mozfiles.com/files/1173562/aimpoint_putting_system.pdfIn PDF document text
    • http://nubigawe.22web.org/best_app_to_annotate_on_mac.pdfIn PDF document text
    • https://site-1168114.mozfiles.com/files/1168114/71629356917.pdfIn PDF document text
    • https://site-1176165.mozfiles.com/files/1176165/givose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_5fb710a71c20a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mopezit.epizy.com/best_cv_making_app_for_android.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/23596262844.pdfIn PDF document text
    • http://limekukojaso.epizy.com/2442555958.pdfIn PDF document text
    • http://kavunuses.epizy.com/pedogabubemen.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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 5428 bytes
SHA-256: 78f79ca4a1de70d1fa995b9c5a811c3105074959bfd864876b51bfc3515effd8
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10460 bytes
SHA-256: 6ae776fad4694ed4576435a83d2a98b2e694e443ceec5d1493f6ffff16ba6f2e

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