Malicious PDF — malware analysis report

Static analysis result for SHA-256 494428335970cf83…

MALICIOUS

PDF

45.3 KB Created: 2020-08-19 11:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a1e87384ff65949279646875ff5b1c SHA-1: 3fe06f31a039676e8b6db4dfafe246c5d52cfd7c SHA-256: 494428335970cf83a0dae0646b5c5dd15e4c01ba3e02e7b0ae2a999aefa90cd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Ielts reading pdf answer sheet' and the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO poisoning or to obscure the primary malicious destination.

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 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.
  • 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.ru/pify?keyword=ielts+reading+pdf+answer+sheet
    • http://files.cbpencil.com/uploads/1/3/1/6/131637374/2558997.pdf
    • http://files.1220productions.com/uploads/1/3/0/8/130813111/wamebinogabuvepuluko.pdf
    • http://files.wolfegranite.com/uploads/1/3/1/3/131381919/fef10471ac.pdf
    • http://pofobezu.marsjoyofpainting.com/uploads/1/3/0/7/130775195/lifusiri.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/wurudotizizeramelov.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/82689080288.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/weather_glen_burnie_md_21060.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/gudepeker.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/29461774158.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/builtwithscience_workout_a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40313354442.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/72334513960.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/nimakixovuxota.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/72952800750.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2720/files/kegixosobinugewiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/30438329601.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ab.bin
b9d02a6115822832620a5470029e23e51703f431aa8d70c941add7e16eefbfd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 5008 bytes
font_01_sfnt_off000078ae.bin
edb16ff34a2d2a29b7ea4b3f98eb6df779bce963e99b7d35f868476cba4c6315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AE 9860 bytes
font_02_sfnt_off00009a68.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A68 4324 bytes

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