Malicious PDF — malware analysis report

Static analysis result for SHA-256 a134f1a6f634be6b…

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 18:07:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 355b373fef1b96f3529f45cf9cb67cfd SHA-1: 2b78fe17e20d193afbe2bf3a9a7fba369264fddc SHA-256: a134f1a6f634be6b2614a8b0d8c54bced61fcf45941d111b9f732a62934d2982
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded links that redirect to a malicious domain known for hosting scam content. The document body and heuristics indicate a lure for game-related hacks, specifically mentioning 'Robuxian Robux Hack Website' and 'cmd-to-hack-roblox'. The primary IOC is the malicious redirector URL, which is likely used to deliver further malicious content or phishing pages.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.co/app/431946152/robuxian-robux-hack-website-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hacks-for-roblox-ninja-legends_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-earn-a-ton-of-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-adopt-me-free-legendary_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/blox-rewards_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-use-cmd-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-roblox-robux-codes-for-roux_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/daily-spin_GM406889139.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://www.nlcitychurch.oIn macro / runtime command snippet
    • 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_off0000313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313B 22244 bytes
SHA-256: d4c5068bfcd0e8f8d1c4671d13508cf5279ca33880a6e6fbd15cf4f8a663565b
font_01_sfnt_off000062a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A9 19144 bytes
SHA-256: 1dead67b2dbcb9baa29e4f2ed439466098f36bb9800199b3ac9b0f70a54de55a

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