Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd81ea3e404e59df…

MALICIOUS

PDF

44.2 KB Created: 2021-05-16 08:01:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f4bb48387db6a49bccf239fddba3caf6 SHA-1: 64e65eb94bf206bd32bb36cb2f3089c3e6cae494 SHA-256: fd81ea3e404e59df9335cd81f402f49d8a7ebb2397329ce65cfdb92073b50f5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including a primary link identified as a malicious redirector. The document body and heuristics indicate a lure for game-related cheats or generators, which is a common tactic for distributing malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/card-hack-in-coin-master-game-hack In PDF document text
    • http://moralcenter.or.th/images/block-best-robux_GM431946152.pdfIn PDF document text
    • https://moralcenter.or.th/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • https://moralcenter.or.th/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://moralcenter.or.th/images/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://moralcenter.or.th/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://moralcenter.or.th/images/free-roblox-wings_GM431946152.pdfIn PDF document text
    • https://moralcenter.or.th/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://moralcenter.or.th/images/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://moralcenter.or.th/images/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://moralcenter.or.th/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://moralcenter.or.th/images/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://moralcenter.or.th/images/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://moralcenter.or.th/images/tiradas-coin-master_GM406889139.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_003_off0000476f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x476F 24816 bytes
SHA-256: e171a008d10ae6b7f0f10f37e4e6c1f5df7dada39a0e8daef52285c74fece894
font_01_sfnt_off00008039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8039 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B18 17888 bytes
SHA-256: eac9cb42de6513dc6552a50abee069bf35bf7768323d30e076f8ef6ec09f6223

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