Malicious PDF — malware analysis report

Static analysis result for SHA-256 0437f25dbaa41f85…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 00:42:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c72eb5e020efcb03f747ef3d0334d2b1 SHA-1: ea5c96f14bc194a2336c9c79a1ebeef346d679d0 SHA-256: 0437f25dbaa41f8580ebe0b183d6fbf53b5c7de1c7cc01d0480244e718227227
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and game hacks, directing users to malicious URLs. The embedded links, such as 'https://netcdn.online/app/431946152/free-robux-promo-codes-game-hack', are identified as malicious redirectors. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.online/app/431946152/free-robux-promo-codes-game-hack In PDF document text
    • http://oca.undil.tl/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dd0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD0 26552 bytes
SHA-256: 27e8fbb857ebfc449e499fd95808d08a8c347e42d65b1852c9eaec70a12714e7
font_01_sfnt_off00008c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C52 2852 bytes
SHA-256: 6c344bff8cb11efcfa323542d02369dac514041cc19c9a49b1052cb126dcbdcf
font_02_sfnt_off00009613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9613 18604 bytes
SHA-256: 81df952e11a915931eb8909d89f5eda5fa0aae9cee1bf8eea3735c5794fb3fb4