Malicious PDF — malware analysis report

Static analysis result for SHA-256 108a2f250d2e98f9…

MALICIOUS

PDF

48.2 KB Created: 2020-08-03 14:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2faf3581036573c9e28b156433895be6 SHA-1: 76b656be6eb480d96d5783cd000c0cf086cd8945 SHA-256: 108a2f250d2e98f9408852713686085a261caa8e733ff1bed3afed9b7816ed85
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to spread malicious content, further supporting a malicious intent.

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=list+of+antonyms+and+synonyms+in+english+pdf
    • http://files.mariapressentin.com/uploads/1/3/2/7/132710627/losoz_jorebaperoniju_riwumedomofenel_taduxekovi.pdf
    • http://files.gracewelcomecenter.org/uploads/1/3/1/6/131637325/8679198.pdf
    • http://files.sdcymbidium.org/uploads/1/3/2/6/132683267/9374837.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/gipilegipibaposiden.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/rutijenofezujawepoda.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/47142645098.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/xobufijibejaguninureg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90262961418.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/lumimijifegat.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/nanosok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/81197803531.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/1_2_cm_graph_paper.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7544/files/zudinejovuwofelexuvuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/speer_reloading_data.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/tiwefusonibenexesuvaw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e60.bin
42d624d631b377c8d8f64165f2054a77ef3417b532c80b8e9e012be959bdf6e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E60 5404 bytes
font_01_sfnt_off000090ab.bin
b8804c56e813b37169124b03796775936325c72925e43e451dbcb33f7835a3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90AB 10180 bytes

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