Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c94bad30f5c1e95…

MALICIOUS

PDF

47.2 KB Created: 2020-08-12 22:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af55d5626ea0b0176c20863dde55b823 SHA-1: c072e454b90d2f4c8b904f9454044ab0776745bf SHA-256: 4c94bad30f5c1e9503302dc15cf43a2ed7e057811947e31223f3bbf69bb6e295
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=cannot+annotate+pdf+in+evernote'. The document body, though heavily obfuscated, contains text fragments related to PDF annotation and the tool wkhtmltopdf, suggesting a lure. The presence of a large number of embedded links, many hosted on Shopify, indicates a link farm designed to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cannot+annotate+pdf+in+evernote
    • http://birerod.cantoncommunityfund.org/uploads/1/3/0/7/130776088/kofapixivekuzik_zajakilaranuw_fikitiwawanik.pdf
    • http://files.elderjacknielsen.com/uploads/1/3/2/6/132681066/1162302.pdf
    • http://files.escher2hands.com/uploads/1/3/1/4/131436981/5280012.pdf
    • http://files.bikini-baristas.com/uploads/1/3/1/3/131378990/5623534.pdf
    • http://files.anatatyaneri.com/uploads/1/3/1/4/131436978/siratujaxug.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/zivefaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/34278286612.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/kexavelumejex.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/6095511925.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/kosexaralunajewakebagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/daragigawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2635/files/zafakemufoximurubesome.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/7981660119.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/human_body_parts_name_with_picture_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/dikadegasudalodagigob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/carcinoma_de_celulas_escamosas_en_animales.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/62097070794.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/mudopobetaboxebezeledopa.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_off00006ee0.bin
7172de1a6353a07d8d7a934b58ffea9ee3aeb5e0c45ff0d0f50e120c027e9b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 4696 bytes
font_01_sfnt_off00007eee.bin
ee94aba5314f4ed43a193c980ec0c4f1462e9aeb435af865c1d6331746ba6197
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEE 10048 bytes
font_02_sfnt_off0000a146.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA146 4324 bytes