Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f85c1d148e8b7d…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 02:31:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4df3aeb4884ca1f7f16f57e73e930b57 SHA-1: 4a7955432aa12d9c4b06b73f9756025bfe954e46 SHA-256: 78f85c1d148e8b7d920f885b2aed3da1bbfc492c533403cdd0287ef73349ed25
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/406889139/how-to-get-free-cards-sets-for-coin-master-game-hack. This suggests the document is designed to trick users into visiting potentially harmful websites, likely for further malware delivery or phishing. No scripts were extracted from this sample.

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/how-to-get-free-cards-sets-for-coin-master-game-hack In PDF document text
    • https://razredna-nastava.net/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-stranger-things-promo-codes-cheat_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-vip-server-free-link-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-coin-master-spin-daily-link_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_002_off00003059.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3059 22960 bytes
SHA-256: 6d86680de14feae2bffc42c90350af62b50597c7c399f1da1c30b74ca7055f6b
font_01_sfnt_off000063b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 18336 bytes
SHA-256: 62ea76718c89f31a7c4f45c7431c072c385949a102d4bb066ded9903bb79e822

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