Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af155d66578b9be…

MALICIOUS

PDF

62.9 KB Created: 2020-11-05 21:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac669669d4d6fb0981e59479eddc79f8 SHA-1: 98bd10037d463eedfdb6f2dd67bf0e7dd9a60746 SHA-256: 3af155d66578b9beec0604a5340d070f9eb9a672a97e6e97aaa021d546ad23db
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm, indicated by the PDF_SEO_LINK_FARM heuristic, which points to numerous other PDF files. The primary lure appears to be a 'Sony mex n5000bt owners manual' which redirects to a malicious URL. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafficel.ru/strik?keyword=sony+mex+n5000bt+owners+manual
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/pizevexunodatelepug.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f89ae9e0e454.pdf
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f91106ada293.pdf
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f89966d61921.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5f9ef005d2833.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8bbe95b2425.pdf
    • https://fixelomutitag.weebly.com/uploads/1/3/4/3/134339240/woves.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/batoragubukepo/guitar_chords_free.pdf
    • https://uploads.strikinglycdn.com/files/68d74ffa-6915-422a-b66b-2c9cf58bbaa9/fifiti.pdf
    • https://s3.amazonaws.com/jobavo/99059026455.pdf
    • https://uploads.strikinglycdn.com/files/5ebfa2e5-2235-43c6-8f70-790c49668ecd/68421950379.pdf
    • https://uploads.strikinglycdn.com/files/2ceb8b6e-aae5-4ef2-bf57-542a014577e3/58121856271.pdf
    • https://uploads.strikinglycdn.com/files/1e6b0982-5683-4edd-8b04-f4817f2e6cb0/65976407379.pdf
    • https://s3.amazonaws.com/nafibanefexex/74281741704.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a81c.bin
ba469ba29a81c131590c402c0a1cc109a7d98880f7ba98e01e4e8777e72afcc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xA81C 5436 bytes
font_01_sfnt_off0000ba8a.bin
306687e4d30145b8a991daa0f1008a79441e1e815c72cd8b10d5752bdcf20320
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 11376 bytes
font_02_sfnt_off0000e070.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 4324 bytes