Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1eeca1ce32b738…

MALICIOUS

PDF

48.2 KB Created: 2021-06-09 02:22:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 15238ab570d03338feffe25a975d2bda SHA-1: cc0aa831fee6ecf7445b9a475ba0704b531b63ef SHA-256: 2e1eeca1ce32b738598c9b266cc53eebb51e6d4647f8cc0f5a60175ef2116ae4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically designed to lure users with game-related content. The document body and extracted URLs point to a link farm that ultimately leads to a malicious domain. The primary attack vector appears to be a phishing lure delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/free-gift-card-roblox-wix-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/broken-bones-iv-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hacks-to-get-robux-in-tower-of-hell-may-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/poke-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-premium-free_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_004_off00005d10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5D10 25388 bytes
SHA-256: 5e9ff8aadd938077e0f09e61eec2dd5bd9343cfcfc29cb597d0ffbc86c29df5e
font_01_sfnt_off00009858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9858 18772 bytes
SHA-256: a073c09125d35f35f54aae81139ec234173c961de65f7c99b2f812bd336e1e58

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