Malicious PDF — malware analysis report

Static analysis result for SHA-256 993886a2624eed81…

MALICIOUS

PDF

37.8 KB Created: 2021-05-13 22:14:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23dd5fb1f45e5f6665e7a91acb40dfc8 SHA-1: e615f5f47f044d7e5bc80aeb7984540f809a9ca4 SHA-256: 993886a2624eed81c5b7c3ddd5b7171ce9ca8bf391243bec5ac5068d449bb172
130 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 game hack redirect lure, pointing to a specific URL. This URL is also listed as a malicious redirector link. The document body, though heavily obfuscated, contains references to the same URL and appears to be a lure for a 'free generator' or 'game hack'. The presence of embedded URLs and the nature of the lure suggest an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0126

Heuristics 4

  • 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.
  • 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/406889139/free-spin-app-for-coin-master-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000316e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316E 24500 bytes
SHA-256: 421fa256e8b74c50890867dc4235367f3e29b0d19fdc6087531e7e0462963e37
font_01_sfnt_off000069c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C2 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 17884 bytes
SHA-256: 64e302a077f8ec1bb79f530eb8d45af8bfabe23c67be24f596f79d031454c781

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