Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ed20e731c16433…

MALICIOUS

PDF

43.6 KB Created: 2020-08-21 23:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e410e3ec832279f315c47210689df6d5 SHA-1: b73de05dfa382ad5b31632114bf85884f720363e SHA-256: c6ed20e731c164332af346b1e23846eacc1238df4674fb0e8266706e403f931e
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'Data analysis software free' and the malicious URL 'https://ttraff.ru/pify?keyword=data+analysis+software+free', suggesting a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, further supports the link farm heuristic.

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=data+analysis+software+free
    • http://falade.eibenteaching.com/uploads/1/3/2/6/132682974/dujakubatir-rawemeso-sawula.pdf
    • http://files.siboprocourse.siboinfo.com/uploads/1/3/1/8/131857193/3342057.pdf
    • http://files.lisabaril.com/uploads/1/3/0/7/130739457/zuxodazopinogav_ramifavumujogo.pdf
    • http://files.mhcs.me/uploads/1/3/1/4/131411539/basipesuji_bolukibeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/15396142995.pdf
    • https://cdn.shopify.com/s/files/1/0438/6678/3899/files/aikido_ground_fighting.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/20674167686.pdf
    • https://cdn.shopify.com/s/files/1/0436/9956/8795/files/86735558171.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/pebewumowuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/wotoritu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/empires_and_puzzles_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/fosiles.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/zenizebokuvunesamudotixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/94627345649.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_off00006d4f.bin
03803f2bfd5ad5ed395245f52e4ce84d363ee8b25dc2a0dd6f487b8c06fc5046
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4F 4952 bytes
font_01_sfnt_off00007e53.bin
14c325f2ee85033e4d8d37849e68ba5a6e638c902d97c03ec8bc80ca61279473
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 10256 bytes