Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ed1af242d2832b…

MALICIOUS

PDF

41.3 KB Created: 2020-09-20 13:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e51f6ad0dcb9910e53fa489e496aee4e SHA-1: a1195fcabfc7427e558a0d47b3a56aea000ef361 SHA-256: a8ed1af242d2832b0db016962759a15ff103157270b0730ff7b468977bee2d70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the URL and a keyword suggesting a lure for search engine optimization. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm strategy to distribute malicious content. The ML classifier 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.link/wix?keyword=gas+non+renewable+energy+crossword+puzzle+answers
    • http://wevino.animachristiretreats.org/uploads/1/3/0/7/130776008/4424f.pdf
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • http://files.michaleens.com/uploads/1/3/0/7/130739740/lemijolagafu.pdf
    • http://files.makealltimetreasures.org/uploads/1/3/0/7/130775242/2563627.pdf
    • http://divumame.ozarksridgecrest.com/uploads/1/3/1/0/131070872/bavolimugukubopisuwu.pdf
    • http://files.xdesign4u.com/uploads/1/3/1/4/131438203/751b9f.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/pipuri.pdf
    • https://cdn.shopify.com/s/files/1/0464/6574/5054/files/algebra_1_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0479/1120/7078/files/pilufajemarejasivurumuloj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/nemitegifisuwam.pdf
    • https://94e39a9e-cf8e-4c89-8141-171175f4c98f.filesusr.com/ugd/361f4b_2d58de2936884a90a88fad0a91873da5.pdf?index=true
    • https://88cbc05f-9d96-4478-b008-89fdeb7f4019.filesusr.com/ugd/1ee69b_96bbfce4dfbe4b9bba226a9b20d94b2b.pdf?index=true
    • https://3c163a37-19e0-4cf4-a97e-ddc4a7c4f21f.filesusr.com/ugd/6c313a_63890626e98345bf8537887a7efba256.pdf?index=true
    • https://c8ccd9fa-9f9a-49dd-8b6e-b9b9db5db516.filesusr.com/ugd/ce14f3_2d27ebf7b349498e898484b3c9b0dabf.pdf?index=true
    • https://51ac798a-9877-46b5-87b2-5704897fd9e9.filesusr.com/ugd/405339_eef25d214ea443d4af37821dadeac6b9.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006132.bin
2ace7bd68429ee31860424957928b114e3683605a2285439a56259e6d9786c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 5656 bytes
font_01_sfnt_off00007497.bin
8e9beffce10aebf34b6a66a1dc498d5586bf38fa184373bcc58be77b1ad8bef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 10352 bytes

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