Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cab5f369500aa91…

MALICIOUS

PDF

71.4 KB Created: 2020-08-07 02:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ef004b1c19bf6d41ad514fb6653e15 SHA-1: ca841814cf11c560da2ec7cbaad3565d4005e895 SHA-256: 0cab5f369500aa91519615f97bcb44b9dbf2dac9e59b969afd274040004e9f1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=the+chosen+chaim+potok+pdf+free`. This URL is embedded within the document body, suggesting an attempt to trick users into clicking it for a supposed free PDF. The presence of numerous other PDF links further supports the SEO link farm heuristic, indicating a campaign to distribute 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 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.cc/pify?keyword=the+chosen+chaim+potok+pdf+free
    • http://sutenod.cherylmccallister.com/uploads/1/3/1/4/131453329/8980800.pdf
    • http://files.moriskyscale.com/uploads/1/3/0/8/130874408/ruvamugenam-wajozamijipe-gufatidin-wetekegipamin.pdf
    • http://files.ashlypianocrafts.com/uploads/1/3/1/3/131384173/8358062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/93209580382.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/65533522213.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/ejemplo_de_acta_constitutiva_de_una_sociedad_cooperativa_mexicana.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/98718713464.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/nugujesisixulobulebivori.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/67827309113.pdf
    • https://cdn.shopify.com/s/files/1/0433/0533/6985/files/simple_present_tense_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9288/files/26477581074.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/butixefiderumapifeji.pdf
    • https://cdn.shopify.com/s/files/1/0430/9234/4999/files/6149850494.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/15867439170.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd24.bin
aa777afd40c79d8ace4c6fdf4af91c7b6d4144280aa557d404573057cc2d6681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 5164 bytes
font_01_sfnt_off0000de7c.bin
ffbb011414d8ac55f136705fc402194f0edd5bc74681a16be56d6b59483ce7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 10420 bytes
font_02_sfnt_off00010239.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 4324 bytes

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