Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c1b503070bf44…

MALICIOUS

PDF

44.0 KB Created: 2020-08-09 08:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fb06f1468048f9b86f4c2ce2530fc90 SHA-1: 9aad561d3e2a7b86c7e5c20e17cb7b367fdf9211 SHA-256: 136c1b503070bf4454bc75d9fb39a958c91bf1e74ba0baabc843ec214173f5b1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'bipolar treatment plan pdf'. This indicates a likely phishing or malware distribution attempt. The document also hosts a large number of external PDF links, suggesting it is part of a link farm designed to improve SEO for malicious content. No scripts were extracted, but the presence of malicious links is sufficient evidence for a high confidence assessment.

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=bipolar+treatment+plan+pdf
    • http://files.araliaonline.com/uploads/1/3/1/8/131871614/xepafuvuvotuna.pdf
    • http://potowixe.yosefrefaeli.com/uploads/1/3/0/8/130814328/batenex_poraziradukiweb_jivogakiveked_tumewirezodemil.pdf
    • http://pevoromo.armonkdance.com/uploads/1/3/1/3/131381428/tisofoxag-gevabi-xaruluw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/47978644325.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/careless_whisper_partitura_clarinete.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/discord_staff_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/calendario_2020_con_festivos_espaa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/lazitexetegivakelomu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9154/0634/files/73453468752.pdf
    • https://cdn.shopify.com/s/files/1/0430/1894/4665/files/21453835288.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/littering_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/faxupezulimasu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/wepunip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/84883487174.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_off0000702e.bin
0afc6c57484cee7af167f8e2c80cb85a970417af8744d770fde33f781f7a07b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702E 5056 bytes
font_01_sfnt_off0000814a.bin
c9954339ed5e224784fc2af6b4a3196989d1beabfcaa4b05c5637d722fccb078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814A 9952 bytes

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