Malicious PDF — malware analysis report

Static analysis result for SHA-256 3729a77728243693…

MALICIOUS

PDF

42.0 KB Created: 2020-08-14 18:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43bba8507222c96dbaf5cf78091b533 SHA-1: 8f25c773957ff2a5c815f1015a4a44a0fae3539e SHA-256: 3729a77728243693e492637887e39bdd036c09707495f60506bba5d139009ebe
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other links to Shopify-hosted PDFs indicates a link farm or SEO poisoning attempt to increase visibility and traffic to the malicious redirector.

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=bamboo+timber+sheets+uk
    • http://files.christchurchmorningside.org/uploads/1/3/0/7/130776168/cb72385299b0aad.pdf
    • http://kuzob.empiricfashion.com/uploads/1/3/0/7/130775971/4813972.pdf
    • http://lafana.paratutor.com/uploads/1/3/0/8/130874429/jegogo-bifomijobexev-gemuveterepejuv-gameruw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/67111426025.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8524/files/9135741032.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/louisiana_real_estate_commission_forms.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/clark_color_labs.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/jidobag.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/wugogedujo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/james_taylor_guitar_lesson.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/kupatonunojisulinimopeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/6077/1481/files/78647240603.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_off000066d2.bin
e9ca6ed9f7eb3c829ca1ebe6792f235e4aa524c99a4b35bf632f290706c786ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 5144 bytes
font_01_sfnt_off0000782a.bin
b28045164bf3c2df5de3d2074e01f6ab493a566bf163d21776969abb4e0824a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 10264 bytes