Malicious PDF — malware analysis report

Static analysis result for SHA-256 562087947a4e6070…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 13:40:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4b96f18e61cd7305a5e1eb18e69df827 SHA-1: 9feaeb37fd540355b00b251e7789bba55de7ffc4 SHA-256: 562087947a4e60708a6176fd7e42afbb5375b4e9099016f7d6e224802af0a41e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are part of a link farm designed to host fake generators and hacks for popular games like Roblox and Coin Master. The primary redirector URL, http://netcdn.tw/app/431946152/free-robux-accounts-game-hack, is flagged as malicious. The document body and heuristics indicate a lure for free game currency, likely leading to further malicious sites or potentially unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-accounts-game-hack In PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/karinsupersweet-offers-200-000-robux-for-free_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/hey-google-can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spins-hack_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
font_00_sfnt_off0000327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x327D 21872 bytes
SHA-256: ad83f6a414e55ce7e398c78467986ed1970bb1fe086d52db0745f28cd11d97bf
font_01_sfnt_off000062cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CD 18820 bytes
SHA-256: 9247447a3c3765c463ad34d06656dabe45291e7d100ded84caf3f858f3985503

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