Malicious PDF — malware analysis report

Static analysis result for SHA-256 847fefc225811180…

MALICIOUS

PDF

44.3 KB Created: 2020-08-15 07:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63699003adc159502e60d82b5b3f9502 SHA-1: 5ad9b8c766d9db28d4d5cdb691c423f7c3952bc7 SHA-256: 847fefc225811180ed4aa6296976b83bbe70753869b33ecae3048cd42cf16f31
182 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bakery+business+plan+nigeria+pdf
    • http://files.christianfellowshipind.org/uploads/1/3/2/3/132303382/b250c55a7f3.pdf
    • http://vuzokute.gryffemusic.com/uploads/1/3/1/3/131398455/pemuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/wowovag.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/pakeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7503/files/gulunexodepo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/worksheet_english_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/18796906384.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/80323265034.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/99573550762.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/kawobukujegunapatanasob.pdf
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/860370203.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/solving_quadratic_equations_bingo.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_off00006e43.bin
b70852a5f9cd06d960f63cc585f1ea3db528541d08ad139c67c6010176e1adbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E43 5564 bytes
font_01_sfnt_off0000814a.bin
b702cacc18a487e2ca507dccede3397c128f47a348e09cd2bc45839192c69191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814A 10400 bytes

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