Malicious PDF — malware analysis report

Static analysis result for SHA-256 79181c8eb4f8c81e…

MALICIOUS

PDF

67.2 KB Created: 2020-08-09 04:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8508a65f7417c70d3d50137b735678f3 SHA-1: 83855d866d90fdb3c290a43bee9fa5feee6a8b66 SHA-256: 79181c8eb4f8c81e1f74a4b20c376481ad77883cabbd27ceda2166408c54e3a6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector link to 'ttraff.com'. Another heuristic indicates a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.com/pify?keyword=shakespeare+plays+pdf
    • http://files.jbschuleranimation.com/uploads/1/3/1/6/131636725/gerotuge_zivofu_vulunegezu_zekesusuk.pdf
    • http://files.hardinsburgbc.org/uploads/1/3/2/8/132814343/lewosup.pdf
    • http://files.tahoejahr.com/uploads/1/3/2/7/132740949/4784912.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8820/6238/files/john_deere_lt155_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/35940337599.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/icse_class_10_biology_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/javascript_array_foreach.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8480/files/rumodenewiziwidafidadinud.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/5262028021.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/61674467549.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/79000958931.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/xifepavudekevibezinavu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8351/2473/files/pojaposiroju.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/bardonecchia_piste_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6229/files/paxaxulusozifarukagum.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_off0000c9e1.bin
f688f63ad1cd9586e4c7318cb55c7669d5cc789d65fd248107a9428c4d7aefe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 5400 bytes
font_01_sfnt_off0000dc41.bin
49ac5b963533937de7f03d470a06369b345ee6f65c2f90f30ee232afb29b4cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10520 bytes