Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d78dfc5f91e9725…

MALICIOUS

PDF

33.6 KB Created: 2021-07-08 08:09:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: edc2b4eb049f91026f150af902bbd4d8 SHA-1: 8d838b2203ffe39d335e5fba88cbb3b3859aa9e5 SHA-256: 4d78dfc5f91e9725cf17c0ece0b42731b62cd4b7989365a09b25ded76b729ffd
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering game hacks and free in-game currency. One embedded URI, http://netcdn.tw/app/479516143/minecraft-game-hack, is directly associated with a malicious heuristic. The presence of a link farm and a direct malicious URL suggests the document is designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/479516143/minecraft-game-hack
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-get-20-body-on-roblox-for-free_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/robux-codes-generator-no-human-verification_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-hack-version-ios_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-roblox-accounts-robuxian_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-spins-for-iphone_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/chicken-farming-simulator-roblox-cheats_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-800-robux_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/cashrapps-free-roblox_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-make-your-game-in-roblox-hack-proof_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-freeze-tag-hack_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/cheat-mobile-roblox-aimbot-apk_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/oprewards-login_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/promo-codes-for-free-robux_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/no-scam-free-robux_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-hack-apk-35-33_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-shirt-template-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fea.bin
7b7c1db1592a0f348d7554381ab31bbd4e3ea1c3646ea44b36341231317bb875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEA 22372 bytes
font_01_sfnt_off000061de.bin
18153eb78e52d10f573a403757bf08b8b042ff0dae7dd3b4cc440df27f37a65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 17856 bytes

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