Malicious PDF — malware analysis report

Static analysis result for SHA-256 4986d02d750d5e0f…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 07:14:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ef962d08d6c48c11f4d1462a002439b4 SHA-1: 1a9e80d434a2bfe7b9bb737be2960e21070ca5b0 SHA-256: 4986d02d750d5e0fe437fce8b88073475f8838e611b2a9ab05b0b20e22c35ca9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering free game currency and hacks, such as 'robux hacks' and 'coin master hack'. One primary URL, http://netcdn.co/app/431946152/robux-hacks-computer-game-hack, appears to be a malicious redirector. The document body and heuristics indicate a lure for game-related scams, likely intended to lead users to malicious sites or download further malware. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or scamming attempt.

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.co/app/431946152/robux-hacks-computer-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/rbx-earn_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/a-free-robux-gift-card-number_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/giving-away-free-robux-cards-live_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/getting-free-robux-by-using-inspect-element_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-passwords-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-girl-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-link_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_off00002e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E89 22232 bytes
SHA-256: b940f039f998272f4df6f283310071297899b2a360522e711b8f06b153f4584f
font_01_sfnt_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 19260 bytes
SHA-256: 24cd9240c0d6d2cd91a65a14ff71ef3c16f263820017772b6ebabaecc53eac33

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