Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da61ed4f3001c78…

MALICIOUS

PDF

138.4 KB Created: 2020-08-01 22:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d576ce30af6bae66c9319b5313f7acf SHA-1: 83444f394557c570d30e45eb480f00395bcec9fe SHA-256: 7da61ed4f3001c78ed50baed202a564061f3e36c80d14bfad8c3c0a1f673c1d2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary payload delivery mechanism. The document body, though heavily obfuscated, contains the malicious URL, suggesting a phishing or scam 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/pify?keyword=mad+men+musical
    • http://files.pregnancyparentingboulder.com/uploads/1/3/0/8/130874455/47fc3.pdf
    • http://files.montaukmist.com/uploads/1/3/1/4/131483108/fimegijika-migadi-genujutemago.pdf
    • http://files.webleedfpv.com/uploads/1/3/1/6/131606295/zezoniluzezutun_limebitet_nodegopap.pdf
    • http://files.lynchbaseballtraining.com/uploads/1/3/1/6/131606636/tepafajizog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/zetegigamaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/nikufisaxivemelij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/67816074744.pdf
    • https://cdn.shopify.com/s/files/1/0433/8781/4044/files/perufezivakumixanug.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/64676594191.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/javascript_if_then.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/vuribipagukowo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/54637113366.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/49173362840.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/votusonojuzosubuveganes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/56528343072.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_off0001dd57.bin
7f145b9c77bdd94e05a82242a922303dee9f005734384f8defdc64e5e4f38199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD57 4996 bytes
font_01_sfnt_off0001ee4c.bin
aa1b247b4aa5342bae8beb3d8c490ebf4fe4fed0ec5b50796147211864474987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE4C 14368 bytes

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