Malicious PDF — malware analysis report

Static analysis result for SHA-256 754bf34d8c902599…

MALICIOUS

PDF

43.7 KB Created: 2020-08-11 06:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 480092f16df7e383740a1879f03c6963 SHA-1: cc8aefdd38ab60a657f79dc3424698ccf74fc529 SHA-256: 754bf34d8c90259911713ff9a4594f82884ff837ed73c9d40b862786469740ce
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains a URL that matches this redirector, suggesting an attempt to lead users to malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, likely for SEO manipulation to improve search engine ranking for the 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.ru/pify?keyword=anatomy+and+physiology+questions+and+answers+pdf+free+download
    • http://files.austriansinhawaii.com/uploads/1/3/1/4/131406717/554a3aeb.pdf
    • http://files.qldphilconsulate.com/uploads/1/3/1/6/131607712/0e1d1.pdf
    • http://files.alexfullermedia.com/uploads/1/3/0/8/130813765/xidepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/99957101047.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/digajiriranazogomuxezomis.pdf
    • https://cdn.shopify.com/s/files/1/0440/1872/9110/files/sir_arthur_conan_doyle_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/equation_of_a_circle_given_3_points.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/bomoberokotorotezek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3782/6973/files/ring_of_elysium_duo_locked.pdf
    • https://cdn.shopify.com/s/files/1/0431/2648/9249/files/penguin_dictionary_of_political_science.pdf
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/47228090597.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/1015323909.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/winowepipakonelafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/37892090896.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/87583775842.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_off000067aa.bin
df8cf078c2a8a15c66fa0473fcdc016ee34ca61252f8a9358780d2ee256ae766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AA 5764 bytes
font_01_sfnt_off00007b29.bin
588aefd2bec7227a02077388df9ab23eb28943a73f0720f88516d178d1a2f4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 10560 bytes

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