Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b8ea45135fe7b5…

MALICIOUS

PDF

45.0 KB Created: 2021-05-19 07:53:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5c96b8b79da8a65f218d4abd06c4e9fe SHA-1: 6d25e5881e0751411b14acc5b2525e3851cee0b4 SHA-256: 65b8ea45135fe7b53eca7a44662c2cda9e307f57d0ba71bb57accb93acbf80c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a "game hack" lure. The presence of a download button heuristic further supports the malicious intent of directing users to external, potentially harmful, content. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coinmaster-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B15 25388 bytes
SHA-256: 9d9025dd6d73b9a509cc84e33a4e89b9c0ada1e1dd6a329ca8a876a9fd91ed81
font_01_sfnt_off00008516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8516 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB9 17808 bytes
SHA-256: af208cdb45bd073d7b5ba90b2b5d7fe18c625e7bd90d48e59b2ee82d337b8146

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