Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f249eab1443fa1…

MALICIOUS

PDF

108.4 KB Created: 2020-08-16 19:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22e834e8b6ce8531a6e3c7a8afc74553 SHA-1: 632a73520be253d23696887aa1bbb96857343ca5 SHA-256: f6f249eab1443fa1b4d04442c5718a8111ec4cfca6045be6be60e373e0b4339b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document title. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, pointing to ttraff.com. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, suggesting a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=subarachnoid+hemorrhage+guidelines+2012
    • http://files.hawg-tales.com/uploads/1/3/0/8/130814258/067306.pdf
    • http://kemijekem.grignonmansion.org/uploads/1/3/1/4/131408027/2456268.pdf
    • http://xakuz.fuajiaamin.com/uploads/1/3/0/7/130775443/suvelazobepopuw-xinataler.pdf
    • http://files.emanuel-silva.com/uploads/1/3/0/7/130740068/924f761c6298.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/10927728479.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/sonorom.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/24946568510.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/22820300661.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/16526780055.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/31812159568.pdf
    • https://cdn.shopify.com/s/files/1/0449/4953/6927/files/astenia_y_adinamia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/89220936791.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/research_title_on_accounting_and_finance_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/rijivatom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/sexobekixinusegegeni.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_off0001660a.bin
5febcccab96f4f6c5bbe620702b4852057e272aea941d20fc3df13423d84cc2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1660A 5920 bytes
font_01_sfnt_off000179fb.bin
472e6b81edbe5990d3ab6c32ecf149d87132a58289f5031833ed33d607d520b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x179FB 13548 bytes