Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fb91c2802e99ca…

MALICIOUS

PDF

36.3 KB Created: 2021-07-05 07:26:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9aaec94cdd2f2080e225647cc034ba6a SHA-1: 0d9dd959f761d9ce978085989a1002efc68b817a SHA-256: f5fb91c2802e99ca8a6cbc57cc5e0b08bbfc7ec25e45be2694d16e679616aa85
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/406889139/facebook-coin-master-hack-game-hack. The document body and heuristics indicate a lure for game hacks and free in-game currency, which is a common phishing and scam tactic. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/facebook-coin-master-hack-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/robux-hack-sex_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-give-someone-else-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-coin-master-generator_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_002_off0000374b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x374B 23124 bytes
SHA-256: a974896c02e526627b74091d1eea4d1e38037cce1626dbd8c2a775c76d83398f
font_01_sfnt_off00006b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 18324 bytes
SHA-256: de5d333ca2731b98d79dd38dcb89bccbbd759d9f6fb5713cf55863557c0b9bf7

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