Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d0e946e4658b64…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 06:31:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6226d18c8ebb71bb3c59a6f15f9892d4 SHA-1: c9260c8b8c2a579aac88d47b42bca49d827f33ae SHA-256: c9d0e946e4658b64b1d46d41737e0f996a9c574d172c8563392c0e74b126e2c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. These links likely lead to further phishing or malware download pages. The document body, though partially obfuscated, contains references to these lures and embedded URLs, reinforcing the malicious intent. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/406889139/2021-free-spins-coin-master-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-midasbuy_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-i-get-free-robux-on-roblox_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
stream_004_off00004ec4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC4 29892 bytes
SHA-256: 2d81135dd185ad738b2c3923e2192e0c243ec9fb38807270615ef3d3e96d28b5
font_01_sfnt_off0000905a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905A 18288 bytes
SHA-256: d5a46c40ddaffffdec7b194e78d64597afed9f46b5e12e45e50a00bb771aa4a6

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