Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73d7aa707cf7fc6…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 14:46:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f0b42c34758f6a8e2c9d5e51746eeac4 SHA-1: fcfd808a660b2bf7e978bbba9c7010ea95f712b3 SHA-256: d73d7aa707cf7fc601ffdc9ad77070061d51b7a54367a39ddfd5905684a8b371
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body and numerous extracted URLs reinforce this theme, suggesting a social engineering attempt to trick users into visiting malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure indicate a high likelihood of the document attempting to download or redirect to a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/406889139/legit-free-spins-coin-master-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/real-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/pokemon-go-free-and-apple-watch_GM1094591345.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/by-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-generator_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_off00004fe0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE0 25776 bytes
SHA-256: 21381116b982eddffd5a7cd93fb96a02059b0f883c5aa71f29dce13ad5bf465d
font_01_sfnt_off00008b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 3820 bytes
SHA-256: 71c28385af78cc571e447a95946f1a08ca9bb0f81e23fc7728d8e4fe8535c088
font_02_sfnt_off0000980b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x980B 18176 bytes
SHA-256: 0e4f5fc6ff2fec7c34f7a60300b1fa14fa22cd043badad59a9fad54dc28be7cf

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