Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ac2f257cad1421…

MALICIOUS

PDF

58.8 KB Created: 2020-08-23 19:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b29ec676317d29300ba01794c1980b SHA-1: aa22859a9ab9b616ef2d4b56ad9ffc4f5e9690ee SHA-256: 76ac2f257cad1421eeea4319460078e8ef6f343ff16a3432d520f3c155258a38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=spinal+av+malformation+classification'. Another heuristic indicates a link farm structure with 24 external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, and the document body, though heavily obfuscated, contains the suspicious URL.

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=spinal+av+malformation+classification
    • http://xeleke.sailabilitybatemansbay.com/uploads/1/3/2/6/132696067/e3894.pdf
    • http://files.angels-of-the-road.com/uploads/1/3/1/8/131872079/pemiguzot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/41659198208.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/vegojirodufigimame.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/netuxonifofozawuvazunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/artificial_neural_network_seminar_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/35607372140.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/benign_paroxysmal_positional_vertigo_patient_handout.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/71672517254.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/aeryon_skyranger.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2002/files/screen_capture_android_galaxy_tab_pro.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8ab.bin
9f18acbeb4f5b5ca2b1a57344f39d2836f695d518f73efb0f02f4dbe65b990bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AB 5324 bytes
font_01_sfnt_off0000baac.bin
1cc6fd758ff2b9c55218c1000f983c1d180ac9dc35f16eb2721813251369f494
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAC 10568 bytes