Malicious PDF — malware analysis report

Static analysis result for SHA-256 086d5ae71004098d…

MALICIOUS

PDF

45.7 KB Created: 2020-07-30 19:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f0222a63f1ef44fa95c60c4be5f190 SHA-1: 90deee94231f9a3494ea5d949d6bdd4391532ceb SHA-256: 086d5ae71004098da7d061677ffd99f1631075b5cfb92cb3b1199bb840476c2a
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 of which point to known malicious redirector infrastructure or are part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, suggests a lure related to a 'verbs adjectives nouns with prepositions list pdf'. The presence of numerous external links, including one to a malicious redirector, indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

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=verbs+adjectives+nouns+with+prepositions+list+pdf
    • http://files.susanlstraub.com/uploads/1/3/1/4/131438188/bemirirufi.pdf
    • http://files.columbinepta.org/uploads/1/3/2/6/132695361/3399333.pdf
    • http://files.boxmouthdesigns.com/uploads/1/3/0/9/130968961/f8235ef50f0af.pdf
    • http://files.co-oplink.net/uploads/1/3/1/0/131069886/talif_giwawiluset_xotobefubele_rawuzakalibuta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/jutas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/27181400429.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/migixuruxavusikenup.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/71773658706.pdf
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/68360472492.pdf
    • https://cdn.shopify.com/s/files/1/0428/6195/3191/files/fufanijulojegumekogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/20040390100.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/84863600067.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/36850298355.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/32028324588.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/93202259791.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_off0000743a.bin
cd8e4119ebe67ef9d39c4535bb08e92e9616b39a62e84f9487d3475e5caad23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 5460 bytes
font_01_sfnt_off000086d0.bin
9f9fbe4a8d14aa4460931d5fdf3a51539ac06862c608c1841a29314263b79eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 10024 bytes

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