Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f07f2708c2bd2f7…

MALICIOUS

PDF

52.6 KB Created: 2020-09-03 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217d27af428ad9066092c8d9f5ae85f2 SHA-1: f3ef231129dcf3bc9e1c8e523353f96590b904b7 SHA-256: 8f07f2708c2bd2f7ac00ead10f42fe09c8462b0075749ebcf75e4c119148a688
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to external resources, a technique often used for SEO poisoning or redirecting users to malicious sites. Specifically, the link 'https://ttraff.me/wix?keyword=programmers+introduction+to+mathematics+pdf' is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links suggest a social engineering attack aimed at driving traffic to malicious infrastructure.

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.me/wix?keyword=programmers+introduction+to+mathematics+pdf
    • https://static.usrfiles.com/ugd/9ea9b6_18a9a9a8e4304a0e9349c825a86e8e2b.pdf
    • https://static.usrfiles.com/ugd/82e28d_1667fb8616b84ef1b4ed6dfa01cb0ca1.pdf
    • https://static.usrfiles.com/ugd/3f80ec_23b93f0bcfd540a5b19319cd9aeb0a52.pdf
    • https://static.usrfiles.com/ugd/3be3a7_f73a3f7ae56743d7893f044f09c78675.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/35277380180.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/59873417336.pdf
    • https://cdn.shopify.com/s/files/1/0436/9920/8346/files/76617423144.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/stranger_chat_anonymous_chat_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/85630233975.pdf
    • https://cdn.shopify.com/s/files/1/0463/9499/8939/files/report_repeated_measures_anova_spss.pdf
    • https://cdn.shopify.com/s/files/1/0432/2852/8799/files/pikemuzelubuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/78187547102.pdf
    • https://static.usrfiles.com/ugd/3a38e0_9a7155f33359402c87febe4c830a4fe1.pdf
    • https://static.usrfiles.com/ugd/afbef4_f2fc09e1eb124e27b741fe475b559e8b.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084ed.bin
447601d14eeb0080d60f366b3c597439032d42f5480838653903cfdcc78cd913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84ED 5540 bytes
font_01_sfnt_off00009790.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9790 1800 bytes
font_02_sfnt_off0000a01d.bin
dcb2ff49af5d1252809aaf01d9db0bc684011a6a4a70350f9c47555c3ff6d3fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA01D 10848 bytes

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