Malicious PDF — malware analysis report

Static analysis result for SHA-256 505851d4f2819105…

MALICIOUS

PDF

31.1 KB Created: 2021-07-31 15:17:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b063bac8c1a99ba9d2468c3df9a09f6 SHA-1: bf33c57e15509640a8ca2071674ab5fd81283e7a SHA-256: 505851d4f2819105d2ff33bddff80838b7073f237162e5ecdf7c67dae9a7ebb8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator' or 'game hack' lures. One prominent URL is http://netcdn.tw/app/835599320/free-likes-for-tiktok-game-hack, which is flagged as malicious. The document body and embedded link actions suggest a social engineering tactic to trick users into downloading further malicious content, likely leading to malware execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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/835599320/free-likes-for-tiktok-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coin-master-links_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
font_00_sfnt_off000029b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B1 21860 bytes
SHA-256: 95fa35aefaf4c0ececa1de87720b1c5fc0eaff4e14f591e3c8f858895328f760
font_01_sfnt_off000059c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C9 17456 bytes
SHA-256: 308920fe04ba02bee84e9df39862d70534e91875b9399095fdfb0b81d81483e5

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