Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf5dbc15a096636…

MALICIOUS

PDF

46.3 KB Created: 2021-06-07 07:08:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cbcabb677fa5e4a620f54a1edf555367 SHA-1: 8573e4ab296ac08455860411941b34b2758be74a SHA-256: faf5dbc15a09663671c47867e3854e6f1ca4b31eeb992b062f8fc6042c7b0006
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game items or hacks. The primary malicious link identified is https://netcdn.tw/app/431946152/how-to-get-free-stuff-from-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/how-to-get-free-stuff-from-roblox-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-tiktok-engagement_GM835599320.pdfIn PDF document text
    • http://library.atim.ac.id/repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.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_off000052f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F8 28356 bytes
SHA-256: c0439593bb1cc7d6be3aaea12a9cbfe36b99a21db79caf9a533edd94572b1dca
font_01_sfnt_off0000917e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917E 18616 bytes
SHA-256: 5f89f588c7d3b3941d2697b862f8c0fd26b26afa34c93436437af9d5560a41c2

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