Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7d91238dc2494f…

MALICIOUS

PDF

41.9 KB Created: 2021-05-10 21:05:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f1147269f37d1bc5b3a2ce83458887ca SHA-1: 1b8bbf79bd725895d5bad2178431b019894cb1f0 SHA-256: ac7d91238dc2494f76c1d256cfceb3b1544ca9deb86fcf2471f97cda3ca57f90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirectors, specifically advertising game hacks and free currency for popular games like Minecraft and Roblox. The document body, though partially obfuscated, contains similar lures and URLs. The presence of these links and the heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/minecraft-pvp-hacks-game-hack In PDF document text
    • http://solidkom.ch/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/robux-get-com_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/hack-coin-master-ios_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
stream_003_off000047c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C8 25476 bytes
SHA-256: 4ccc59528b9072379d7695b61a84d30e530bdb22bcade3ef1260e74afa2dc917
font_01_sfnt_off00008204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8204 18180 bytes
SHA-256: 0e2f0ac061c68c7eb9671630210144f167660a9976ef74b494f6c2985e791cfa

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