Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca625522b4675ee2…

MALICIOUS

PDF

48.7 KB Created: 2021-06-11 03:39:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b9fa3c73bcc597fbf12d3dd32a446f13 SHA-1: a862d691cd128fd021a5b2152ef5d433f704ce80 SHA-256: ca625522b4675ee259d6ada6dbbda270d4a635a42dce40dcde8b76e8fa376b84
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'Roblox Hack Tool Online'. The document body, though heavily obfuscated, contains references to game hacks and generators, reinforcing the lure. The primary heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-hack-tool-online-no-download-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-shinobi-life-level-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/robux-website_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_004_off0000536c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536C 26196 bytes
SHA-256: f3d1c2501484537b150e4d861864a17a67b780602af06118abf8f0c60bebc229
font_01_sfnt_off0000903e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903E 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off000099d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D9 18808 bytes
SHA-256: 975a69af13f409d46c23c4640ce91138c06de99e8664d5edd5c0190f1935e86a

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