Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cb106126ef9cca…

MALICIOUS

PDF

38.6 KB Created: 2021-05-14 00:41:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 783a13233ac6e4ea3a0de0cd2d064d54 SHA-1: ed015e08930b5e0bccde2fc3b44527944408d442 SHA-256: 73cb106126ef9cca20a9d44d27825b31d18be2bb7eeec752d17975a8e83e2c03
170 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, disguised as a lure for a 'free generator / game hack'. It also exhibits a fake CAPTCHA heuristic, intended to trick users into interacting with the malicious link. The document body and embedded artifacts do not provide further specific details on the payload, but the primary intent is to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/moonactive-free-spins-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_off0000313e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x313E 25924 bytes
SHA-256: f230b239ff10dfb71ff67c17ead521b3d9998f1ac6561aa3fdddfc67b521a835
font_01_sfnt_off00006c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5D 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000760e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 18000 bytes
SHA-256: 525e065cc595701650099d1f547d5a2db26dd24a903bd4cc3081529fc79bef99

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