Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4508711dc92c3c…

MALICIOUS

PDF

41.2 KB Created: 2021-05-12 04:30:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 72b74649dbea24e76911593f4e9f83ad SHA-1: f998f8ee5782eeca7c19ffac8bb7f424d99a7eaf SHA-256: bf4508711dc92c3cd317ee282b8c295f120378c2fde9fa7b76f02111cd269378
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and SEO link farms, with the primary lure being a 'Coin Master Coins Hack'. The document body, though heavily obfuscated, contains references to the malicious URL. The presence of numerous links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/coin-master-coins-hack-game-hack In 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/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-inappropriate_GM431946152.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/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-roblox-premium_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/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-bedrock-server-hosting-free_GM479516143.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/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-servers-that-allow-hacks_GM479516143.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/coin-master-hack-2021_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
stream_003_off0000491a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491A 24220 bytes
SHA-256: bc65d53c6e9be34d242a9b4c8603f5c4ed39b6dace0d237c5bfa9bebbfd4f413
font_01_sfnt_off00008055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8055 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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