Malicious PDF — malware analysis report

Static analysis result for SHA-256 72043bc5520b800a…

MALICIOUS

PDF

77.8 KB Created: 2020-12-27 10:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aace2e32c7c2b60dc5ad980454cf3a06 SHA-1: 1485dca9b318c09d4c8f7ba30e0f5f3de4dd5f5a SHA-256: 72043bc5520b800ad00f3154f08387a1b3467b59d9cc9d09e7c7c63a059439ff
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or distribution mechanism. The primary URL, https://trafftec.ru/strik?utm_term=entrepreneurship+online+courses+stanford, appears to be a lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to distributing further content or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/strik?utm_term=entrepreneurship+online+courses+stanford
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5fc69314a0eb0.pdf
    • https://cdn.sqhk.co/fifapupifig/WifQwAA/70827441680.pdf
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fbc9e1c30bb3.pdf
    • https://cdn.sqhk.co/jalizovi/iijgjiy/dark_sword_2_mod_apk_latest_version.pdf
    • https://static.s123-cdn-static.com/uploads/4422893/normal_5fcf3e842c697.pdf
    • https://cdn.sqhk.co/ranotigu/Rhb63UF/tolomigajepalifupilulobew.pdf
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fd14cac4e91e.pdf
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5f96135e727c2.pdf
    • https://cdn.sqhk.co/walumupo/UUi6jC1/58661156839.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fb8d763913e9.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/6161841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/90d51d9e-5647-4592-aaca-e03f03d76dcb/fakuranekisakawuvepaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d718.bin
4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 2960 bytes
font_01_sfnt_off0000e199.bin
27ed72dac7e92b371650f203e1dc7f5f4b4a7176589ff0092cb91755990701e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5084 bytes
font_02_sfnt_off0000f2d5.bin
5766ad610fc82e350f64b032268f6b02535662337c1007be338bca7be142dfd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 11960 bytes
font_03_sfnt_off00011b70.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 4324 bytes