Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aab0afb129efa58…

MALICIOUS

PDF

47.6 KB Created: 2021-06-11 12:40:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c745ca356b6a9ef1d39aa4798addd515 SHA-1: a42fcac25a3ba8618b3508be3630729ca907f8ec SHA-256: 6aab0afb129efa5866f20b0fc611b665820ba013f6b6eaf97beb85e9e94c7db4
200 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users into clicking on them by promising game hacks and free in-game currency, impersonating brands like Microsoft. These links redirect to malicious infrastructure, indicating a phishing or credential harvesting attempt. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-ultimate-driving-free-cars-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
  • 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-ultimate-driving-free-cars-game-hack In PDF document text
    • http://suaedy-library.net/repository/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-hack-nopde-engine_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-roblox-for-robux-via-console_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/join-this-roblox-group-for-robux-free_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/wurst-112_GM479516143.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_off00005230.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5230 28968 bytes
SHA-256: 14529c523b07a911f98d4b7842f0ccd2b70d8d284b0904d2508ce0080a49ea87
font_01_sfnt_off00009427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 19416 bytes
SHA-256: ccf82959fad26bb9e73737e1411e446be9c36dab376d1c9e055dde14d88647dd

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