Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b5cd794f3a3886…

MALICIOUS

PDF

49.9 KB Created: 2021-06-04 03:39:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ced4012082dff55dc0b8c4ac8567cbbd SHA-1: 4e689190dd030ea738068f984d34f8d7c96f3c1d SHA-256: 10b5cd794f3a3886bc71be3a559f84af3ae8596c95824adc4d35c3de03645ff5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator' for a popular game. The document body and embedded links suggest a lure to trick users into visiting these malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.online/app/431946152/roblox-murder-mystery-2-hack-exploit-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-20210-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/20210-pubg-uc-in-rupees_GM1330123889.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/tiktok-free-iphone-12_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/hacker-minecraft-song_GM479516143.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_off00005332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5332 26092 bytes
SHA-256: 22719c8e61ffb2b4b6e70c9372411c8dbc6d4146ca47c6e1c3bdd37cd2190362
font_01_sfnt_off00009086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9086 3608 bytes
SHA-256: 38b270e1156baf55f52eefd6c0272d25f41d6b4ef7b6a9aa3301989c4dacee27
font_02_sfnt_off00009d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0E 19396 bytes
SHA-256: 675d64c49af0d8b141776ece3e3e262a34c32457e9ad83daf6658fe8e5c77efa

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