Malicious PDF — malware analysis report

Static analysis result for SHA-256 707ad6c2824928a7…

MALICIOUS

PDF

44.6 KB Created: 2020-08-28 06:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 950b83bc002433f450f8109b3c1aee48 SHA-1: d4a67c27d48d6c11dc2ff6e77b9aa8ad52a9f338 SHA-256: 707ad6c2824928a7bf5e44c195d74a5b3b8900eb66e47add992180db240ea56e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common tactic for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a medical condition and a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites.

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=fratura+de+patela+tratamento+cirurgico
    • http://files.hannahlynchphoto.com/uploads/1/3/1/4/131407281/4576040.pdf
    • http://files.cardinalaviation.ca/uploads/1/3/1/3/131398366/zoxumadafuxifidanixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/midagulid.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/37587712540.pdf
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/basolitukerubawudelex.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/34147291111.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/panuwoviwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/mojelijamugibadurixus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1266/files/a_fast_iterative_shrinkage_thresholding_algorithm_for_linear_inverse_problems.pdf
    • https://cdn.shopify.com/s/files/1/0437/5026/0890/files/waxosogimex.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/nuguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/48359140029.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/fogakavumipulijetabojusiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/lire_le_journal_el_watan.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/49038292080.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_off00006d89.bin
e9aab1b17d8ce29b065ce49361756a473fcde048aa20c89754d157d2dda7221c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D89 5172 bytes
font_01_sfnt_off00007f09.bin
3f1b31e28ba6210da0897d45e339e531ff55844f5c0b53280396fadeb91193ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F09 12692 bytes

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