Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a876d095e7cd767…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 07:21:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 693a440d815cf1d0f6ae6b71946cd1fa SHA-1: 8541318364539fcf4a35c0e77d8c6866a19406c7 SHA-256: 8a876d095e7cd76745439194fd77a0b479e41e75236398b305cfc93eb52fc396
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external URLs, including one identified as a malicious redirector associated with 'game hacks' and 'free Robux' lures. The ML classifier also flagged this PDF as malicious. These findings suggest the document is designed to trick users into visiting malicious sites, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-hack-roblox-to-get-robux-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/oginject-co_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/pro-pubg-xyz-uc-hack_GM1330123889.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/robloxheroxyz-free-robux_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_off00005120.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5120 30188 bytes
SHA-256: 89edc42a85abda4e83ccd7c7c41c448cc6c6d6c92c9bf6c871e52cba1ba5272b
font_01_sfnt_off000094a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A6 18588 bytes
SHA-256: 6723e17a0e3ea7e17da9fa5ee91cb22fe0fa4706a6f3d09ae44dda015c08872b

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