Malicious PDF — malware analysis report

Static analysis result for SHA-256 a003b10f538a364b…

MALICIOUS

PDF

37.8 KB Created: 2021-06-11 11:15:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aee5a8cde43523c24db9bf7135bcebf3 SHA-1: 5991d998884d72169b0ca29fb922ecf55d53a2bf SHA-256: a003b10f538a364b280977a59af8577a063d5c7b71d9e231ff47437bdab90f19
170 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'game hack' lure. The document body text and embedded artifacts reinforce this by displaying similar luring content and a call to action. The presence of a password-protected archive lure suggests an attempt to bypass security controls by encrypting a payload.

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.tw/app/431946152/digimon-masters-roblox-cheats-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000034a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A5 26536 bytes
SHA-256: b595f1e10be32ba5e143a1618dc81d3761a4763c8345b2faccff8b81b0efbbfe
font_01_sfnt_off000070b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 18900 bytes
SHA-256: 6da584228e8b2c3cca137aaef86e5d3e87c52ca1c38cd1ca43ef4dde7ecf2907