Malicious PDF — malware analysis report

Static analysis result for SHA-256 919f810fc251705b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 03:04:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 776aac10da905220180dea669a82a1f9 SHA-1: 48701e5190eb758a0a3dfda245c0d4b2df2d9cc0 SHA-256: 919f810fc251705b13ab0e064eeeaf4902eb3fab6bb995d524e6ff2b8a7c8ba6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts further malicious PDF files. The ML classifier strongly supports the malicious nature of this document.

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 http://netcdn.co/app/431946152/how-to-get-free-robux-no-hack-or-human-verification-game-hack In PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-download-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-robux-ios-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-account-roblox-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/robux-hack-with-inspect_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-promocodes-for-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-free-rig_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-hats-that-are-free_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-help-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_002_off00002f58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F58 22308 bytes
SHA-256: 4277e30f6c92a4f69018eac2c462529357be7a6ce7f28271881b22e0e76f0472
font_01_sfnt_off000060c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 19668 bytes
SHA-256: b52d01962671e4ef505657e79599b8431fa2a0757aa365ab3875ae4a67f2a436

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