Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bf7c305522b1e4…

MALICIOUS

PDF

34.1 KB Created: 2020-08-12 22:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21b14c8c2a86e115eca1f0fb375f199 SHA-1: b2499a67b040f367e6912d5846b6a4a5dee66abd SHA-256: 37bf7c305522b1e4654f663b06af2a248f835ef682f81c56574a4c52335e66c6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=benim+hocam+tyt+biyoloji+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=benim+hocam+tyt+biyoloji+pdf
    • http://ronag.mychemicalguys.com/uploads/1/3/1/3/131398455/lenedozegawuji.pdf
    • http://files.terrencejon.com/uploads/1/3/0/8/130873708/9294522.pdf
    • http://files.mobilemusicphilly.com/uploads/1/3/0/7/130775837/retikusuv_kafexil_gavamokupesura.pdf
    • http://files.commonwealthmun.com/uploads/1/3/1/6/131636923/c26d43e097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/peredopugamiwudubotajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1903/files/98365835439.pdf
    • https://cdn.shopify.com/s/files/1/0435/4437/9546/files/xijazibiginejemafurupel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/48639675728.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/dudetefodani.pdf
    • https://cdn.shopify.com/s/files/1/0432/1941/9291/files/mivojadere.pdf
    • https://cdn.shopify.com/s/files/1/0433/2489/9496/files/93665729530.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/91058411373.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/14162286987.pdf
    • https://cdn.shopify.com/s/files/1/0431/6001/0912/files/mesogiramujugiziwedajisu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/43207097094.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044ec.bin
734dda6379b4a475ced79ae541eace6c5157e344dd4d3bc00255851ad0572db1
pdf-font-stream PDF embedded font (sfnt) at offset 0x44EC 5488 bytes
font_01_sfnt_off0000576f.bin
dde405bfc8325f7a95955c4da04d8c697a0acfc6f478ef57d8bad62d5da42be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x576F 11280 bytes