Malicious PDF — malware analysis report

Static analysis result for SHA-256 41664f8c8195f9b6…

MALICIOUS

PDF

45.5 KB Created: 2021-05-12 16:46:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8dee887745594243e754de3483153b11 SHA-1: 07eddb055a37be26396d76f8953936e7cec30ae2 SHA-256: 41664f8c8195f9b6d08fe62257448ed49c1f638ae525fe653942f24f554f3dfa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' for popular games. The document body and embedded URLs suggest a lure to download potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/best-tricks-co-robux-game-hack In PDF document text
    • http://hardbit.cn/images/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/apps-for-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_003_off00004bee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BEE 29236 bytes
SHA-256: 0362aee046e048822d6908941705d6305517aa526abd1f0c9e55d54e268f3955
font_01_sfnt_off00008fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB9 18244 bytes
SHA-256: 6afc49dcdc06995850e4f79f174129e4c8f3989aab61000e7222bd3966fc18fb

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