Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac7f34c64241833…

MALICIOUS

PDF

46.9 KB Created: 2021-05-11 04:02:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8ddfb3e4e78d66ec376e161988d2ef83 SHA-1: b8619ec393b9e3cf21c87691ac0ae9ace67583b5 SHA-256: cac7f34c64241833ea94142ecd68b403a64c1784bb054ac7867642efe2ca2b4d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to game hacks and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract traffic. The primary lure appears to be related to 'Roblox Promo Code To Get Free Robux', as seen in the document body and associated URLs. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-promo-code-to-get-free-robux-game-hack PDF link annotation
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.stedwardscheddleton.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-using-cheat-engine_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
font_00_sfnt_off00004bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD1 25596 bytes
SHA-256: 4f03facd4203023f10c3b959bd6e9267836be4128e39b64f5e3e9eef820ac9c7
font_01_sfnt_off00008692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8692 3928 bytes
SHA-256: 10a1b2cc560659abe57eb95579849d63719107c6413dc0cb6974d72a6433670b
font_02_sfnt_off00009376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9376 18780 bytes
SHA-256: 57e6eef1fbc3af66d8c5b48d94799429ebee4b6256a60c8d2844d61f1a05fc0c