Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d3f2c4c94ef293…

MALICIOUS

PDF

47.9 KB Created: 2021-06-09 07:53:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1b1c56f34f0143f57ed0441bed36d967 SHA-1: 73bfd9ab2c400bf89c8df7c02831937e38cb8e27 SHA-256: e1d3f2c4c94ef293fb5ab0c1a37568464783b34a320fc33c4c9bb4c0b3168e6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent call-to-action, suggesting it is designed to trick users into downloading further malicious content. The ML classifier also flagged this PDF as malicious. The primary lure appears to be related to obtaining free in-game currency for the game Roblox.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-robux-for-no-cost-game-hack In PDF document text
    • http://www.drent.se/images/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.drent.se/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-roblox-obby_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/cheats-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-2021-with-inspect_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/robux-game-com_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.drent.se/images/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005081.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5081 24348 bytes
SHA-256: b473ff89daf2d008aaf57c5a448501e14b27b7a0d36003015e90777cdaf829c0
font_01_sfnt_off00008811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8811 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_02_sfnt_off0000984f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x984F 18280 bytes
SHA-256: 7ac2b47389e57e56570849773e6fff238b790c160899fec5852bc28201c0bb88

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