Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c2cae042bccf86…

MALICIOUS

PDF

39.7 KB Created: 2021-05-21 21:19:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d11b6a81f836f87ff545399b27d0bcaa SHA-1: 737c2fd9966b67bfaac2ec6787ecca5e565d05e9 SHA-256: 55c2cae042bccf86d84eb48e6bdc010eaf2a16cb652c8b0a485334afde37db9d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free coins and spins' for games like Coin Master, and also Robux for Roblox. These links likely lead to further malicious content or exploit kits. The document body and heuristics confirm the lure is for game-related cheats, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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-coins-and-spins-for-coin-master-game-hack In PDF document text
    • http://ff-klaffenbach.de/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-games-to-play-for-free_GM431946152.pdfIn 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_002_off000032c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C3 25476 bytes
SHA-256: f6113fa353a60b0f8f374163e67c678c5151cfe03f9b01f9cf67c17e4c306675
font_01_sfnt_off00006dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00007a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A51 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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