Malicious PDF — malware analysis report

Static analysis result for SHA-256 3944abf6145a9da4…

MALICIOUS

PDF

33.0 KB Created: 2021-07-21 07:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7925ed9a5ec6067b759602184f722df5 SHA-1: 6576fe2dd56eab2ab46f2ddb4ea68838add060ad SHA-256: 3944abf6145a9da4c21ddb9acc082c7410ccdfcc9c68dc7af3c0e4898e9aee1a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Free Coins' and game hacks. The document body and embedded links strongly suggest a lure to a phishing or scam website. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/406889139/coin-master-free-coins-game-hack In PDF document text
    • https://roberto-gac.com/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://roberto-gac.com/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://roberto-gac.com/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://roberto-gac.com/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://roberto-gac.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://roberto-gac.com/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://roberto-gac.com/images/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://roberto-gac.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://roberto-gac.com/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://roberto-gac.com/images/best-minecraft-hacked-client_GM479516143.pdfIn 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_002_off00002d02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D02 23008 bytes
SHA-256: 05c1d91fa7af443950b8e07f53be4ae07bbb55e843f3774ce6971cbd8a9b2d61
font_01_sfnt_off000060c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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