Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c0aef7c98824b…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 14:45:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e5c7701e1c9fd38646f7b7b043897788 SHA-1: be7ea7f50c8051049a3bc23f5ab65cbc78617ac0 SHA-256: bd7c0aef7c98824b3a5b03cfb5319eed43151458635ceaa7cf598d18338e5333
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a lure for game hacks. The embedded URL leads to a domain associated with malicious activity. While no scripts were explicitly extracted, the PDF structure and heuristics suggest a malicious redirector designed to trick users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/406889139/coin-master-free-spins-deutsch-download-ios-link-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hax_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-website_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-downloading-apps_GM431946152.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_off0000504b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504B 25344 bytes
SHA-256: c2b12b56ff5083e75f6f97b0d7c1afc414d24a267b9a82a4788db7f5a2861b62
font_01_sfnt_off000088bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BF 2956 bytes
SHA-256: cc6ee08a5af07cdf809d5f718a6f4b581fc47059b13d069ac995502e41039ee4
font_02_sfnt_off000092e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E2 18944 bytes
SHA-256: 8404235b8cfd74d6d6f1010ca69935ae214dcf577c73904f30617ca7dbf1d164

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