Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a46ecea9e7800c1…

MALICIOUS

PDF

47.0 KB Created: 2020-08-03 10:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d69ae92d3c0b6dad7372306dcdd2a4 SHA-1: 50f630e3958f032acf404bd01f32c6164cc84614 SHA-256: 0a46ecea9e7800c16cf065af324af7742b8f41d73e42e13fba0b3891fcd58910
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=discrete+mathematics+johnsonbaugh+pdf'. This URL is likely used to redirect users to malicious content. The PDF also contains a mass external PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to create a link farm for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=discrete+mathematics+johnsonbaugh+pdf
    • http://files.laminatedturningblanks.com/uploads/1/3/1/4/131483027/39e8a0.pdf
    • http://files.morganmckeen.com/uploads/1/3/1/4/131454816/5300176.pdf
    • http://files.joyinparenting.com/uploads/1/3/1/3/131384300/b6cac3fb050ed01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/vofilusinuselo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/korejofaginokosag.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/34445856210.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/85643591865.pdf
    • https://cdn.shopify.com/s/files/1/0434/7068/4317/files/tewopebaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/83264492337.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/ffx_remaster_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/fourth_grade_rats.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/zimademirisubexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/niligowijejolivomuwaluzid.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/tokawigixon.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/gexetelipax.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/19726974310.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_off00006e10.bin
630fb6063b5af33209f728e04bcdd8d47e283308dd1442d7a90352f9d65ae38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E10 5752 bytes
font_01_sfnt_off00008182.bin
961fa43ef3c80ce8e26aa5f5a6746af536283cd2daa218af14da943c488a7aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8182 14760 bytes

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