Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf731b04939c5f37…

MALICIOUS

PDF

49.7 KB Created: 2021-06-03 09:08:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c9ad76d26112e8a966cbe06d13d0f84b SHA-1: d888451c0851d668d2d0b21e5258d451a58fcf85 SHA-256: cf731b04939c5f370911013c6b8cefb8555fb6e19ed6525beeff605745e6ea33
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 'free generator' or 'game hack' lures. The document body, though partially corrupted, also contains URLs pointing to similar content. These findings strongly suggest the PDF is designed to trick users into visiting malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/free-robux-images-game-hack In PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/pubg-uc-load_GM1330123889.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pdiperjuanganbali.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_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_004_off00005332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5332 29432 bytes
SHA-256: adf0d23c0f8109f23f37d14fe19dc3a0cadfeffa9bbc7d2d204b020fa1ea6e29
font_01_sfnt_off00009452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9452 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3C 18792 bytes
SHA-256: a2580c58451f3b1d88c8ceab1016c43f7244c9e681afad5968b7c22bbe0132ae

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