Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb324550f2ed91f…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 22:42:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8d6d6d2905b2142f969630e7f843d8d1 SHA-1: 418f0ebf150f681b67bd15d1c4b0e82b13cc5ebf SHA-256: bfb324550f2ed91ff3189c8e3c5e0e600e49f5798fccd0b68ce830280fb01ee4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free stuff' for popular games. The document body, though heavily obfuscated, contains references to these lures and a primary URL. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-free-stuff-game-hack In PDF document text
    • http://librarysenior.com/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/2021-roblox-place-free-bricks_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-server_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
stream_004_off00004f91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F91 30260 bytes
SHA-256: 0a1c7e7a85980b61843807aba9a75e7f522b122f82e7051795d2444a22830638
font_01_sfnt_off00008ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF9 17848 bytes
SHA-256: 49970788d519349fbd5ba6badf06c324563f4794a9a5c1e41d0627a31815ac32

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