Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3904c2af1d07d6…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 04:01:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ab72d60d6fee8660e943be337bca08ec SHA-1: 17f721ae86c3191512e22c9113a249f0c149889a SHA-256: ba3904c2af1d07d6c62fab60a0bbb97c20ded5a5cd457dba2c4906def9658f86
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free game hacks' or items to entice users to click on malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. The ML classifier also strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.xyz/app/406889139/100-free-spins-for-coin-master-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rbx-sites_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-but_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-group-free-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_003_off000047f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F5 24216 bytes
SHA-256: ec9349d7b19555662065b4f6d25f7f78714a1ac268602eb9575e7a1293ae6e4e
font_01_sfnt_off00007f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 18164 bytes
SHA-256: 7606299dfa9380825ccbbaa06a4275f303ebe4faec3a3444b55fb030233e8f05

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