Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb36b46c8eeee86…

MALICIOUS

PDF

43.1 KB Created: 2021-05-16 06:41:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: afb78aab39fc27b2a4dd37c09d5e0ebe SHA-1: b29d36e7ab30b454f326b19fecb1d9f4d814d718 SHA-256: 4bb36b46c8eeee86145209ff4dd0e62e672f9a7adf8d0cc4fc8acea8dbd1c2d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and other PDF files hosted on external domains, masquerading as game hacks and free Robux generators. The document body and heuristics indicate a lure for users interested in obtaining in-game currency or cheats, which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a redirection chain designed to lead the user to potentially malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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.xyz/app/431946152/free-robux-accounts-2021-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux-in_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-com-www_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
stream_003_off000048f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F6 26728 bytes
SHA-256: 5a263e5c3a34ac7224b58718d197bd3dd196cd0c11ba5049b1f1b53afacd4cd7
font_01_sfnt_off00008571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8571 18520 bytes
SHA-256: 56624e41a965b33e02442574776651ebbc56d14fd3e4bfe95c3ae0db26e97c49

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