Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b14604d0f00cde9…

MALICIOUS

PDF

44.3 KB Created: 2020-08-20 20:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c38d529f13ed9eda32719d3c8868ad SHA-1: c243b46b742a5da83e6a1c0a874217d7d523dea0 SHA-256: 9b14604d0f00cde9896c4e9f3ef9528f884b7d386dd463b3bb9cc70305192b50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was identified as malicious due to the presence of numerous embedded links, a technique often used in SEO poisoning or link farm attacks. One of the primary URLs, 'https://ttraff.ru/pify?keyword=albi+nadak+kayla+zamzam+metrolagu', is flagged as a malicious redirector. The document body contains garbled text but also includes the same redirector URL and several other PDF links hosted on various domains, suggesting a coordinated effort to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=albi+nadak+kayla+zamzam+metrolagu
    • http://girafen.pvvikingfootball.com/uploads/1/3/0/7/130775923/vuvopegafetas_xinebukukitiwax_bamed.pdf
    • http://files.charlesheinerfiction.com/uploads/1/3/0/7/130740563/togexusus_wapinada_zawagasodufe_vixobuge.pdf
    • http://jewutugo.12gaugemicrophones.com/uploads/1/3/1/1/131164250/6874991.pdf
    • http://files.ebast.net/uploads/1/3/1/4/131410094/gifugukejafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/valores_morales_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/82454850255.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/30587251362.pdf
    • https://cdn.shopify.com/s/files/1/0460/6466/4731/files/sheetrock_mud_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/pilago.pdf
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/33010909015.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/cassava_planting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/powtrka_czasw_angielski_wiczenia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f4d.bin
fc5b0dc84332af738805f97905f73c2a7e084c17a7bae6076e4db32fd5273ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4D 5312 bytes
font_01_sfnt_off00006155.bin
f4f28869f47447838238f21aaa197024184a897673c143bc8925d67f4fe8519c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 10508 bytes
font_02_sfnt_off00008578.bin
5a171252d280841e366d3d174c967e6de54efba3a9695e3619098f4dd4bb6745
pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 19276 bytes