Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3e70d0b1b835d5…

MALICIOUS

PDF

34.0 KB Created: 2021-07-08 01:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a125089005ba8c684f4962c3879f8bde SHA-1: 69e214849a74689f9bd4749b7c39afc78d138e9d SHA-256: 4e3e70d0b1b835d5d5bcecf238db9a11916a851482830ea5fb1ebe10ed6afd8e
182 Risk Score

Malware Insights

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

This PDF document employs a game hack lure, impersonating brands like Netflix to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/431946152/robux-cheat-game-hack, redirects to a page hosting numerous other links to game hacks and potentially malicious PDFs, indicating a link farm or redirector for further malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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: http://netcdn.tw/app/431946152/robux-cheat-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 http://netcdn.tw/app/431946152/robux-cheat-game-hack PDF link annotation
    • https://learnwmf.org/image/data/files/mcpe-hacks_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-hack-without-human-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-free-hat-codes_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-december-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/spare-reborn-roblox-hack_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/bitcoin-mining-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-robux-on-phone-easy_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-admin-roblox_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_off00003007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3007 21920 bytes
SHA-256: 7397f3d5cc7144abea9d287c879969d5ba8f1d8468dfc33e4148d4b0738ac55f
font_01_sfnt_off0000607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 18820 bytes
SHA-256: 37f2cbed7862a525c1327ce05c27341cf40a6b7f3d64c9c700a10f02169ccde8

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