Malicious PDF — malware analysis report

Static analysis result for SHA-256 c231256611e46953…

MALICIOUS

PDF

46.9 KB Created: 2021-05-12 20:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6a546f19b17cab6a82c4a21bccf52511 SHA-1: dc91d71ed0b6d7587a60ddd2f72bad07b94dccda SHA-256: c231256611e4695325bebd1c560c0e77d7ab9f088d7d28da9b3d8a10243d8584
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a game hack or generator. The document body and embedded URLs suggest a lure for free game items or hacks, which is a common social engineering tactic. The primary malicious action observed is the redirection to potentially harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/play-roblox-for-free-on-google-game-hack In PDF document text
    • http://apx-centre.ru/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/easy-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/level-coin_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-coins-hack_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_off0000469a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x469A 28780 bytes
SHA-256: 0a6c85ad22d576206321ea5c9d962589edbc46e961fdb4145081378dee4303a9
font_01_sfnt_off0000877b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x877B 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off0000931c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x931C 18796 bytes
SHA-256: 63700f01b577dfc47d2d7c093b2e3a9c26c7058fe46ada2950921e4142c9fe98

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