Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d7b7e75fabb57b…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 01:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 41f74bdcff5c170ab8fabb77e8908b6b SHA-1: 4abf51703fa600ac2bc5634c89e5a9ab593992ed SHA-256: f4d7b7e75fabb57b947424634d39d26a659a764a9be3131de1420ad8fcfa90a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a 'game hack' lure. The document body, though heavily obfuscated, contains references to the malicious URL. The presence of embedded URLs 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.tw/app/431946152/how-to-be-a-roblox-admin-for-free-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/offer-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-account-hacked-crying_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/make-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/infinite-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-hack-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-adopt-me-hack_GM431946152.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
font_00_sfnt_off0000531c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x531C 24676 bytes
SHA-256: 55a9450e8d09e7418e935fbdef2e7a2b39ce30700490e78b6d3b96667f4d2897
font_01_sfnt_off00008b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B12 18664 bytes
SHA-256: 408fe0b8dcdb5cba9306394f27474c78036e6d255d284e4b8deb5a932f28bc98

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