Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c1dbd7fccaa4aa…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 11:06:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7c818acd7db77bf4c9ebe8facf5006d6 SHA-1: 507d95004eeeaea3d863bd0c3826331f8981ce97 SHA-256: b9c1dbd7fccaa4aafe42529af627ce13d2429bbc16003ea0b1b28e694996c27d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and free currency generators. The primary lure appears to be related to 'Classic Minecraft Net Hacks'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures strongly suggest an attempt to direct users to potentially malicious websites, likely for further exploitation or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/classic-minecraft-net-hacks-game-hack In PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-money-on-jalbreak-roblox_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-make-cheat-engine-work-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/links-hack-30-robux-adfly_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-royale-high-free-diamonds_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/rbxcity-free-robux-instant_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-get-free-boy-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-get-free-robux-website-and-group_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-get-minecraft-for-free-on-computer_GM479516143.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_off000033e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E4 22004 bytes
SHA-256: d3c76b64c0ecc8f071d1c02722b40a4415dbd7cce8c06ef0dea56d55222f107f
font_01_sfnt_off0000646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 18100 bytes
SHA-256: e5e43c4f2a76601b68ea8201b0c37883eedd9e77f9c7f84ae37ad33981ff38f3

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