Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f1fb41d3bba24…

MALICIOUS

PDF

42.1 KB Created: 2021-05-19 23:36:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 65ea054b38e03f314585268189229a0b SHA-1: 7f3c64a4d79bd77afc89cc61fbdd5a3ba363958b SHA-256: 812f1fb41d3bba24f29a32c44fe3f6e05c61e43110c0b8f2faefa637e8ef1f40
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector infrastructure, masquerading as a generator for game currency. The document body and heuristics indicate a lure for free in-game items, which is a common social engineering tactic. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-coin-master-spins-2021-link-game-hack In PDF document text
    • http://ff-obertraun.at/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/what-tiktok-free-views-app_GM835599320.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://ff-obertraun.at/images/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://ff-obertraun.at/images/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://ff-obertraun.at/images/free-spins-and-coins-from-coin-master-game_GM406889139.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_003_off0000486d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x486D 25108 bytes
SHA-256: cdda35c4a8a596b6aeccf41ccf0719b1a1485ce856ee888cd96c2bf252d0486f
font_01_sfnt_off000081c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C2 18456 bytes
SHA-256: 5afa98feccd95d8eb179cf82941ba5e9245b2aa88804d11c8626ac43caff3152

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