Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c7f74e28abae83…

MALICIOUS

PDF

40.5 KB Created: 2021-05-17 00:15:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 328e29e27f3bf88c72ebed2eb22c190e SHA-1: 545d81c5cfd99f02ed49797cf42555276521223e SHA-256: a3c7f74e28abae838df1a05f514f8ee582e694e7619259e3d5a6cb5eb219e931
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator' lure for the game Coin Master. The embedded URL is associated with known malicious infrastructure. While no scripts were extracted, the document body and heuristics indicate a social engineering attempt to trick users into visiting a malicious URL, likely for a scam or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-spins-and-coins-coin-master-2021-link-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_off00003617.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3617 26072 bytes
SHA-256: 1d5322d883948528ac94f1cf00f0a8dd589a63832a4302c0e775ca1f068e1f5e
font_01_sfnt_off000071e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E0 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCA 18632 bytes
SHA-256: e5cba94a653a55f068ca82f0c7712f51eecd5e3013a204785266329deafd7ed1

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