Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27d90db460e3a83…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 11:31:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3aaea5d9218cdceffe770ef8160cb096 SHA-1: 0e9912ad998dbaf286cba47cf2bf05b57f49c0c1 SHA-256: f27d90db460e3a83db9d23719f83fd9bf646d62a33bcac1fa17e674e032c424f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links, including one identified as a malicious redirector leading to a 'free generator / game hack' lure for Roblox. The document body and extracted URLs reinforce this theme, suggesting a phishing or scam attempt to trick users into visiting malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/431946152/www-roblox-com-robux-free-game-hack In PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-on-roblox-mac_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-hack-no-human-verification-and-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-gratis-hack-paginas_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-wall-hack-viper-venom_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/como-quitar-no-soy-un-robot-en-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/has-roblox-been-hacked-before_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/i-got-hacked-playing-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-dll-scrips-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/all-free-roblox-items-2021_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_off00002e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E28 22256 bytes
SHA-256: 11aa1e231eedb290ea595db7bb7138eea1dc2e694a1a9fcc634ce305686ade21
font_01_sfnt_off00005f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 19412 bytes
SHA-256: e3c8c7c2ff0f885c816f02c31cddbc793d7a6ff74f38847110c716c7ceebbac0

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