Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9a7758937038fd…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 18:29:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b5bcdf08de178a2b199dd3ac010bfe24 SHA-1: 31bc7479ce5a1bdc88e9afb39c22078e6e890ff7 SHA-256: 3e9a7758937038fd666579ff77df00a0a53d66413debdfef29b2211829bc76bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free currency, with one link pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a lure for users seeking in-game advantages, likely leading to phishing or malware download sites.

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/406889139/coinmasterhack-club-game-hack In PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-be-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/tiktok-free-movie-website_GM835599320.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-fashion-frenzy-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-dayz-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/blue-maverick-hoodie-roblox-free_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/map-for-free-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/minecraft-pe-free-ios_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_off00003314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3314 22896 bytes
SHA-256: fa5415954517fd6fc6ee3766bdfbd1ebba66390d0976498e5568ad2778d9f4c4
font_01_sfnt_off000065fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FD 18804 bytes
SHA-256: 00ba98d5e77721c9e524ff0a63be7b74d2880e6b955548df8efbf20b888d56ef

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