Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7fa0bfb7ad94b3…

MALICIOUS

PDF

44.4 KB Created: 2020-09-29 18:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c887021deace98da76145b28ed9480 SHA-1: 0414005698624e75c44a5257536c6a643a85e40e SHA-256: ed7fa0bfb7ad94b30edee7b15a413168f42462e3fdfe1cef3ece248ed7c9b295
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to known malicious redirectors or link farms. The document body, though garbled, contains text related to 'public finance and private finance pdf' and includes URLs that appear to be part of a SEO link farm strategy. The primary malicious URL identified is https://gettraff.ru/strik?keyword=distinguish+between+public+finance+and+private+finance+pdf, which is a known malicious redirector.

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://gettraff.ru/strik?keyword=distinguish+between+public+finance+and+private+finance+pdf
    • http://files.patricialynne.com/uploads/1/3/0/8/130874262/pokapobetanaxu.pdf
    • http://files.diguptheyard.com/uploads/1/3/1/6/131636984/sudimevipad_nifad.pdf
    • http://gatunib.goldwalkmag.com/uploads/1/3/0/7/130740003/7726342.pdf
    • http://dulosivet.cganim8tion.com/uploads/1/3/0/8/130874380/1375122.pdf
    • https://uploads.strikinglycdn.com/files/ff4443cf-e961-445d-b26f-978af2b82cad/foleto.pdf
    • https://uploads.strikinglycdn.com/files/07c150c8-7f5f-4814-9815-a4eb02fba53a/98846706030.pdf
    • https://uploads.strikinglycdn.com/files/e8dbdd32-77b9-4510-b426-5305db798375/jotoxapabatadumifukepoban.pdf
    • https://uploads.strikinglycdn.com/files/81862167-b094-413f-a0ab-d5720906df8d/89287127911.pdf
    • https://uploads.strikinglycdn.com/files/ba2f1e46-43fe-45f4-a1f9-9e3f15e36fae/63217613940.pdf
    • https://uploads.strikinglycdn.com/files/4c55012b-03d8-4a79-af50-9e4d8c1dd5a2/96615552599.pdf
    • https://uploads.strikinglycdn.com/files/42cc5544-691e-42f6-b29d-9faeeb8cdba7/mipopew.pdf
    • https://uploads.strikinglycdn.com/files/7cd9112d-0539-46a8-829d-ab5c202ee638/kisanarasolitigesev.pdf
    • https://uploads.strikinglycdn.com/files/c340dac2-e88d-479f-9d0e-c1186ea5c721/5490377720.pdf
    • https://uploads.strikinglycdn.com/files/f301e439-7091-4dd0-a959-3ca5e4c4b68e/86789086593.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_off00006e3e.bin
81eb2845a7f52b51bdb3d66829f32391ae3a054dcf26a9f2a6ea94516a9be502
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 5708 bytes
font_01_sfnt_off000081bf.bin
5652c50967367b9d919d93db1b91369c843adb49cf7b66b7a2b8f26d9b7ccf18
pdf-font-stream PDF embedded font (sfnt) at offset 0x81BF 10144 bytes