Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a44de6244a1b25f…

MALICIOUS

PDF

36.8 KB Created: 2020-08-30 18:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8860298426077dbbfa8e5a290f36556 SHA-1: 447902fd6ab727220fbe1680a39efe763fc2b343 SHA-256: 0a44de6244a1b25f82dd7817b6dfd66de0cbb960be53f5409ed0636fda3db0d1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to external content. The presence of numerous other Shopify links indicates a potential link farm used to obscure the malicious destination. No scripts were extracted, but the overall structure and URL usage are indicative of a phishing or redirection attempt.

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/wix?keyword=desmos+%25C3%25A9quation+d%2527%2527un+cercle
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/87624229726.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/lexireparerulubonokeso.pdf
    • https://cdn.shopify.com/s/files/1/0441/4147/8040/files/zaxigudisakunotumifaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/86070358410.pdf
    • https://cdn.shopify.com/s/files/1/0429/2493/3283/files/xipim.pdf
    • https://cdn.shopify.com/s/files/1/0441/0349/9928/files/atresia_esofagica_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/bazenupak.pdf
    • https://cdn.shopify.com/s/files/1/0429/0219/2287/files/wood_elves_grand_campaign_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/linear_vs_nonlinear_functions.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/45624339728.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/61132984591.pdf
    • https://static.usrfiles.com/ugd/576447_b1e72b1344bf46998a2da995b2607122.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a1e20dd27f2416ea1efae8364f4157a.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_off000042fc.bin
d920e1b246b07e0bf05c786aea65ff834fafb79356d0e8ce2ae5d19b6023fb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42FC 5268 bytes
font_01_sfnt_off00005487.bin
8ef709a2911904feb6dc68011cf74283cbe824c6fac1d46916b921139ec712e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5487 10608 bytes
font_02_sfnt_off00007629.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7629 4324 bytes

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