Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a492a37d71e459…

MALICIOUS

PDF

36.9 KB Created: 2021-05-13 05:08:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61185735614ecf55fe2b7263d3dd4966 SHA-1: 22062648b95159a310cd6c05e61baf02b2814ec1 SHA-256: b3a492a37d71e45953459ec3ec72c17bf8ee38c2feef6a6e313feb0750f5562d
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body and embedded URLs reinforce this lure. The presence of a 'password-protected archive handoff' heuristic suggests a common tactic to bypass security controls by encrypting a malicious payload, which is then likely delivered via the malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.xyz/app/431946152/free-roblox-accounts-generator-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000328e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328E 25988 bytes
SHA-256: 8efcf1c6086ca5ddb30ffa4b017b217f883977a432e4935d07e935987a49a3ae
font_01_sfnt_off00006e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E77 18420 bytes
SHA-256: 53882506a585ec055cfd1b3dca4ddad0c6693ab294b081b26afef1ed42434664

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