Malicious PDF — malware analysis report

Static analysis result for SHA-256 7953e6c7668384aa…

MALICIOUS

PDF

55.8 KB Created: 2020-07-26 01:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66f81a05b765e0d5cd06b2eedd29f24e SHA-1: 9ba3327e725a4a2acde556b46a65bbe493e86796 SHA-256: 7953e6c7668384aa9a0cb6644589076d183712e4ac3aea0aa2cc56fba522076b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

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=guidesman+knife+and+multi-+tool+set
    • http://files.thehumblecouplesco.com/uploads/1/3/1/6/131606330/0fc6da.pdf
    • http://files.cathrynweissportfolio.com/uploads/1/3/1/4/131407183/8511dfe48415e56.pdf
    • http://files.charlayvangoshen.com/uploads/1/3/1/3/131380689/memanig-tudujumemuxutoj-dakilo-nagidijena.pdf
    • http://files.nancylarondajohnson.com/uploads/1/3/0/7/130738636/bofexidew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/fifivivijamexofakav.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/75753257169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/55924595148.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5312/files/gojesarudadibigepebareke.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/lufukugixut.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/13718686494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/xifesefevul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/89663197336.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_off00009ce2.bin
f28131e50c3f7108bb94fe873dde1d95859e66b07ad6847637e3831a0a950d60
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE2 4964 bytes
font_01_sfnt_off0000adbf.bin
3ee042341723a250191fc251ff3e100a46504f5ac4bed83498899dea0bdefb48
pdf-font-stream PDF embedded font (sfnt) at offset 0xADBF 10592 bytes