Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb409499baf2e54…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 13:51:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 56a7bd1873cb0758165922cab994d0c5 SHA-1: 7afb4390be08d9c1e0c1bc4a802b31489125136f SHA-256: edb409499baf2e54980950e1f40875e7a528b47dc18f32f6de821cc59fbbd672
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors and lures users with a fake CAPTCHA to trick them into clicking on a "free generator" link. The document body and heuristics indicate a social engineering attempt to drive traffic to potentially malicious websites. No scripts were extracted, but the embedded URLs and redirection behavior are strong indicators of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-hack-tool-no-human-verification-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-followers-on-tiktok-no-human-verification_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/can-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-hack_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_004_off0000522f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522F 24812 bytes
SHA-256: d6c9c7f0b2489398398cea7ff2b2c95e0e705fc2048a4691f21a2f907a6b9e53
font_01_sfnt_off00008a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A53 18324 bytes
SHA-256: 5d68777a78810bbeddf54f77e6d16d790f52e44d40945c316f4b63d7801a6e5b

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