Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c35b33142ea7d8…

MALICIOUS

PDF

46.1 KB Created: 2021-06-08 22:47:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3a69c976e59ffc57afa13cd315a59fd3 SHA-1: 730027a31de7579a11b091e19181a12a796ee780 SHA-256: 35c35b33142ea7d8f532240a2d0e7fe37f2b03c7bf3b36a189cbd8221078f9d8
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites that impersonate brands like Roblox and Facebook, luring users with promises of game hacks and free currency. The heuristic firings indicate a link farm designed to redirect users to potentially malicious content, likely for credential phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to compromise their accounts or systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-hacked-client-2021-game-hack.
  • 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.tw/app/431946152/roblox-hacked-client-2021-game-hack PDF link annotation
    • https://silvterie.com.br/images/ckfinder/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-spins_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/real-roblox_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-spin-and-coin-blogspot-com_GM406889139.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
stream_004_off00005359.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5359 25784 bytes
SHA-256: 073bfbb6522e4892a6aeff3c7a2bfef2629be142440b378ba4a816f81829a7a1
font_01_sfnt_off00008f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 18984 bytes
SHA-256: 80a0bd14c0b1bf08e15348c1e3801b27f4e1b9f3dcecf5dbb3d144db2c6a90d9

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