Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eeccdf41ecc1d55…

MALICIOUS

PDF

39.4 KB Created: 2020-10-04 01:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c7e08bb54a069db592573d1828b1bb SHA-1: 4db55112c85ce86336e96abe60673744a681107c SHA-256: 3eeccdf41ecc1d5515a25333389d4c4945a5acf709dec7b4671fb03f0afa6a0f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains designed to host numerous PDF files. The primary link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign to drive traffic to malicious sites, likely for further exploitation or phishing.

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://ggtraff.ru/strik?keyword=proforma+fatura+pdf+indir
    • http://files.luzniak.com/uploads/1/3/1/1/131164198/6099681.pdf
    • http://files.lzventures.com.au/uploads/1/3/0/7/130739240/d6048388.pdf
    • http://files.comicstripteased.com/uploads/1/3/0/8/130874307/latuper.pdf
    • http://files.nmcaahs.com/uploads/1/3/0/9/130968956/68ea7bcb.pdf
    • http://putatos.hr-connectht.com/uploads/1/3/1/6/131607600/fed3c7912eac9f3.pdf
    • http://files.dvremodel.com/uploads/1/3/1/4/131438071/4e6d5569fcdb0.pdf
    • http://vesaja.desireelowit.com/uploads/1/3/1/4/131406663/3751584.pdf
    • http://romixi.jacquelinedeangelis.com/uploads/1/3/0/7/130739616/fd4ca3.pdf
    • https://site-1039167.mozfiles.com/files/1039167/volonu.pdf
    • https://site-1039863.mozfiles.com/files/1039863/19555844754.pdf
    • http://fifanesu.carterandcompanybroker.com/uploads/1/3/1/1/131164159/6260105.pdf
    • http://nowijojed.homeworshipping.com/uploads/1/3/1/4/131483418/bozalu_sigatenepi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c0c.bin
85d9da614ff88f9d5d8f8fb9cf930a46e29b8ece86aa1fc3b617d577975a104b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0C 4744 bytes
font_01_sfnt_off00005bf7.bin
13fc24f09392e6d6ef546ca7c17e1e05ccf387162e964499384c2329d3461d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF7 11704 bytes
font_02_sfnt_off0000813a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x813A 4324 bytes