Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5df62b820a03bd…

MALICIOUS

PDF

31.8 KB Created: 2021-07-19 12:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d6f81f0e77247d372c94fec7666f1cf5 SHA-1: d11dd3b40be35dc1e07521dd12b59a3673cf9d46 SHA-256: 6b5df62b820a03bdebfad5c0c20c0119608dd1ca825239ba061de2e18a23c08e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering 'free generators' or 'game hacks', a common lure for malicious content. The heuristic firings confirm these links point to known malicious redirector infrastructure. While no scripts were explicitly extracted, the document body and embedded URLs strongly suggest a phishing or malware distribution attempt.

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/431946152/hacks-roblox-game-hack In PDF document text
    • http://ktn.com.br/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://ktn.com.br/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://ktn.com.br/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://ktn.com.br/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://ktn.com.br/images/rbxfree-com-free-robux_GM431946152.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_off000027e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27E5 22412 bytes
SHA-256: 3a0e40e7aa0f752a0ad8cc0eb188f42d9e509ea8201f4e1e3c811b9413f4cadc
font_01_sfnt_off000059c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C0 18368 bytes
SHA-256: b8b640b5b196fa252646c462dc29713fca9a534dd8fe06a5ca39aa37add75235