Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e41e76a1c03a5eb…

MALICIOUS

PDF

42.0 KB Created: 2020-09-02 03:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06e4903bcfd620e8f91475a4cf053713 SHA-1: fa5638b1ee1f94bb5a26c2dadccb4bd34c549c93 SHA-256: 5e41e76a1c03a5ebfc4bfa767bc80f960fbdfa2ae39cfaaead8565f70dfd6090
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, and one of these links, 'https://ttraff.link/wix?keyword=double+cross+math+worksheet+answer', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous benign-looking PDFs in the link farm is likely a tactic to obscure the malicious intent. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution 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.link/wix?keyword=double+cross+math+worksheet+answer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/824332_65dca40ce6bf4012b3dfc7506171e1b2.pdf
    • https://static.usrfiles.com/ugd/c63dba_578f849470b24182ae9df641d14e544c.pdf
    • https://static.usrfiles.com/ugd/3c8574_233faa42c29b442d913f56c35f4d7a1c.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/58317720179.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/dd-_214_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/99566751241.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/wivofutusesinotopinew.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/60519144786.pdf
    • https://static.usrfiles.com/ugd/b11f6d_c7c05ff369f34893b02d2fb3b7c2c651.pdf
    • https://static.usrfiles.com/ugd/fe83c3_b1cdf3f5f67448f0bf4e96eba41c2831.pdf
    • https://static.usrfiles.com/ugd/1f2646_5f92063cfe924786bc4242cbe53db968.pdf
    • https://static.usrfiles.com/ugd/a31856_2997d2abe90a48bd99a2950f222da450.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/xasitivos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7448/5400/files/73360707348.pdf
    • https://cdn.shopify.com/s/files/1/0433/0464/8859/files/35144756028.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/14715695084.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_off0000654b.bin
3fd7db32004bcad70fd1b3c1d2f3d25c7ac8888d90b878409a432b20df94a914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 5336 bytes
font_01_sfnt_off00007754.bin
951ac1d99a2fc76071f3bfbe9c82d9724907b4da341174916edb74d2da83d692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 10456 bytes

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