Malicious PDF — malware analysis report

Static analysis result for SHA-256 7228227258e50b2c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-01 22:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9af21f0e8773aac49555077894c29b6 SHA-1: 0b7dc364e0faf5017b882dc55b87f63b8638e832 SHA-256: 7228227258e50b2ccc11a6769ae0f38a122d9b4851a70e90b25728b5a4398583
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports the attack pattern. No scripts were extracted, limiting further analysis of execution methods.

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/wb?keyword=visual%20semiotics%20theory%20pdf
    • http://files.thesaddlexchange.com/uploads/1/3/0/9/130969817/2772636.pdf
    • http://files.theclaytonconnection.com/uploads/1/3/1/3/131382595/pilumorolexojoteme.pdf
    • http://files.shamrockstudiosentertainment.com/uploads/1/3/1/4/131453253/dofolod_vujone_feboxeka_jisesaparima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/sagufejusonevizowaladox.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/74365671875.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/5682237326.pdf
    • https://cdn.shopify.com/s/files/1/0440/0647/3886/files/69355230268.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/mitibarutugesewadubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/farubijujobuwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/vidaxixatukezasiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/24702019219.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0772/files/piwerebamilikixijijifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5832/files/marez.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/kigonodes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/lagadekalukafazimelij.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/lomevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/jometuvovakomezorerik.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/pejadebavetodimazojififa.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_off00006389.bin
95844aa22973b3b98e26a04650a34ea744dd14b93fe2501bcb758a4e27b031ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5460 bytes
font_01_sfnt_off000075fb.bin
7fd6805ebad569188b47a710335383011888b41ecb5b951e182596b50a27163a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 9812 bytes

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