Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f2f317d4915d0e…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 08:22:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b22eec74951e781667680d26f1d5f1b0 SHA-1: 4d024035481079c585d691bad7fcec17a6d7901e SHA-256: 39f2f317d4915d0e7abca6cf88ac72229c2669b7451275326fdecde8be1f24c8
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to a website offering 'free generators' or 'game hacks', specifically mentioning Roblox. This is a common lure for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/roblox-free-play-no-download-game-hack In PDF document text
    • http://library.umla.ac.id//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/pubg-uc-list_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/block-best-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/blox-rewards_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-facebook-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_004_off00004e12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E12 28476 bytes
SHA-256: f9a262914f64921157d95071a9d18e2f59996735a3b6b6b02037b05875f76c72
font_01_sfnt_off00008ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA5 19016 bytes
SHA-256: c08b0bfed4549b0a018fdd65c7ecfbabaaf271df113fe836b296c7344acf0339

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