Malicious PDF — malware analysis report

Static analysis result for SHA-256 31515895651b33b6…

MALICIOUS

PDF

36.1 KB Created: 2021-05-10 17:30:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7fce1a1a0820dbdeef9d52193279a38b SHA-1: 6f4941cc989c9535fdd8212f7865716472a010be SHA-256: 31515895651b33b6b3b6111da931ef285a5ba4c4da3e0a2899aed393ce6bcb8a
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 disguised as a 'free generator / game hack'. The document body also contains text and links related to 'Free Robux Codes Generator' and a call to action to access a Roblox generator, further supporting the lure. The presence of a password-protected archive lure suggests an attempt to bypass gateway scanning by encrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0283

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-robux-codes-generator-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_off0000317d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x317D 25052 bytes
SHA-256: 43c21e26c3b40b4d805b102f0f45a38900e4b4b65efba1fa9ca9febc92e8fc22
font_01_sfnt_off00006aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABA 18520 bytes
SHA-256: 1c25fc10cbc7d9d0374bcdf27ae43ed9c15c29ea4d1fc113120e8f54655ee57b