Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38d205dd5e8977e…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 21:14:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3f5dad568398875ffe63031c8fef7b35 SHA-1: 6aa7ea6ee53aa9e215a28c01aea9d779671dce69 SHA-256: d38d205dd5e8977ece394054ed6c273ee390a2f4ed7d00646463cb2c9036ba21
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains references to these lures and the primary redirector URL. No scripts were extracted, but the presence of malicious links and the lure theme strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-daily-free-spins-2021-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/tiktok-get-free-followers_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/daily-free-spin-and-coin_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9D 24444 bytes
SHA-256: 2ad0b73d7f2655485f7a0e3e18158e08abb5de785398e020899859ef2a5783bf
font_01_sfnt_off0000841f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841F 18708 bytes
SHA-256: 0e09573a858265cfc65c534eb28458a66078312e2bd7bae94317e03ea41fcd19

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