Malicious PDF — malware analysis report

Static analysis result for SHA-256 8404a10891123984…

MALICIOUS

PDF

50.2 KB Created: 2020-08-18 14:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5527d1d821c9d6230f8a01f7d45fe9d SHA-1: 5d4610e8f8cc326ede2bd26a1d381cacacd1feab SHA-256: 8404a10891123984f4d95634fb7ac68cc5ce65f329587d6d6bcc9cad4c1a637b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to potentially malicious domains. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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=narasimham+songs+free++malayalam
    • http://files.salayhouseburma.com/uploads/1/3/1/4/131407274/rowoliza.pdf
    • http://files.jerseyco911.com/uploads/1/3/2/6/132680901/pujorikuj.pdf
    • http://files.affinityspeech.com/uploads/1/3/1/4/131453194/gakumadod_fatanozupuvoxaf_vewix_wikoxerikawogo.pdf
    • http://files.evansmstheatre.com/uploads/1/3/1/6/131637257/sexore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/4736/7335/files/belt_bucket_elevator.pdf
    • https://cdn.shopify.com/s/files/1/0428/6437/8022/files/shigley_mechanical_engineering_design.pdf
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/dieta_astringente_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/1030/1847/files/how_do_you_draw_a_heart.pdf
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/fiwibav.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/riwogizowelenat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/40503214178.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/94662461810.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_off00008206.bin
1abf1fdf58fe3e5b42f5ad1ee93e87b0936c8053e0a5ba739a04cf5310f8ccfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 5252 bytes
font_01_sfnt_off000093cb.bin
45f8ecc19a68a049df3d8b076f87e02bf801c730f816285dd09a146665e31831
pdf-font-stream PDF embedded font (sfnt) at offset 0x93CB 12580 bytes