Malicious PDF — malware analysis report

Static analysis result for SHA-256 2818951b1388b92c…

MALICIOUS

PDF

71.0 KB Created: 2020-08-02 21:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4ff55b5728aff46d666fba12782d03 SHA-1: b01bc05dfd721905f44b1a6ec71a597b8145eb22 SHA-256: 2818951b1388b92c84a7c970622c148adf7d598d299247fdfd61aef0f955f689
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious content. The primary redirector URL is https://ttraff.ru/pify?keyword=okami+warriors+sekiro. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a social engineering or redirection-based attack pattern.

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=okami+warriors+sekiro
    • http://files.elkhornvalleyhrc.com/uploads/1/3/0/8/130874612/8397628.pdf
    • http://files.borderphotos2010.com/uploads/1/3/0/7/130776489/jenazomumil.pdf
    • http://files.ksschoolofdesign.com/uploads/1/3/2/7/132710717/tujojukiwixo_zogetenizov_kikofepasa.pdf
    • http://files.esan-network.co.uk/uploads/1/3/2/6/132696465/8247721.pdf
    • http://files.thelivingroomprojects.com/uploads/1/3/0/9/130969775/8ae3b6.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/81995269981.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/39350464734.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/38056785707.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/80993760785.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/vikodez.pdf
    • https://cdn.shopify.com/s/files/1/0439/7475/4462/files/fewivomezepemojajuzedilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/zivikepixurunaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/93900068604.pdf
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/t25_workout_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/29497249011.pdf
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/73137177958.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_off0000daf6.bin
38af51e573736ef81d53d45ab9aefc6a19533d235d9645c755cb82a8d8d7681c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 4984 bytes
font_01_sfnt_off0000ebe4.bin
53be88bae6d9b952c9e560da42dace021d140fdd769bdfb8f456b3aa38358c03
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10380 bytes