Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9b1b5cb1865a2f…

MALICIOUS

PDF

51.6 KB Created: 2021-06-08 18:14:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 975fce6ce1584148f4548224cbc5dd37 SHA-1: 4aea9b81dede7a5b014979a27492d1d507e0382f SHA-256: 0a9b1b5cb1865a2fffd331716d261d89996cbfea0522d361766b242e5e583162
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, masquerading as game hacks and generators. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The primary attack pattern involves tricking users into visiting malicious sites via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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/beyon-roblox-tries-hack-2021-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/ispoofer-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000521d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521D 25652 bytes
SHA-256: 8f86e50d4233c8dd681c52f5d533a7f400e93a5a87feec14550044a61aa43223
font_01_sfnt_off00008e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1C 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000a4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CF 18884 bytes
SHA-256: c909d789b4c80dc3fffa4993afad8e7062be05a7632fbaa9080daadca09f9e00

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