Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f5da9cd427bf2b…

MALICIOUS

PDF

41.5 KB Created: 2021-05-10 14:13:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 983bb475aae0b227cee0fb1c8a7dbd8e SHA-1: 4cbf12fb851599ce67701cf3d5e93c789d3e50bc SHA-256: d9f5da9cd427bf2b63fb106fc625998f534a6a3876b0792416cf954d45504b83
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks or generators. The document body and embedded links suggest a lure to download potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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/431946152/roblox-girl-game-hack In PDF document text
    • http://apx-centre.ru/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/jailbreak-roblox-hack_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_003_off000048f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F5 24628 bytes
SHA-256: 3310a71816c900afdb7383da60adbddff1f4e756b67b290aaf34566f06474d96
font_01_sfnt_off000081b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B0 17904 bytes
SHA-256: 0198c4e576fabf4ae71baaa50901788f8596c154ad681f47ebe4edd98d45d4fd

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