Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dd8b7d7a5ee6f3…

MALICIOUS

PDF

35.1 KB Created: 2021-07-01 23:35:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 86984f8b56765d4e21d7d3fc88618160 SHA-1: 0a798aa1c4e034d820bb1929bb72444bad955cb1 SHA-256: 37dd8b7d7a5ee6f3d70b7102abdb24318ff0390e8305e039a55009abafab2979
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links disguised as game hacks and generators for popular games like Robux and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'PDF_GAME_HACK_REDIRECT_LURE' confirms the deceptive nature of these links. The primary URL, http://netcdn.co/app/431946152/how-to-get-free-robux-on-mobile-game-hack, is likely a gateway to malicious content or a phishing site. No scripts were extracted, but the document's structure and content strongly suggest a phishing or scam attempt.

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.
  • 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.
  • 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.co/app/431946152/how-to-get-free-robux-on-mobile-game-hack PDF link annotation
    • https://www.advancissurgical.com/uploads/files/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hex-number-gives-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-meep-city-money-cheats_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-avatar-free_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
font_00_sfnt_off00003104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3104 22560 bytes
SHA-256: cbda5d13ed431f7ee623cc1352a4cb3d41a48d4b8fcc56f0fed5dc640c9c27f9
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 19372 bytes
SHA-256: 5331e3b47e1eecd1b1cb57ee2f3545b8b8fbb1b10f6e158321778d87dfa25569

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