Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f419c030959efb1…

MALICIOUS

PDF

36.1 KB Created: 2021-07-03 15:46:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: da66cdcd0adc29f29ba42073c45c26eb SHA-1: de38dc6726402abb3eae3ba5b6a19d00fd946b9a SHA-256: 3f419c030959efb10d8a4ae6eb42554133a45c58be736eb33ea9482ed5780c0b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising 'Coin Master Free Spins' and 'game hacks'. The heuristic firings confirm the presence of a malicious redirector link and a lure for game hacks. The document body, though partially corrupted, contains the primary malicious URL, suggesting the intent is to drive traffic to this malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-facebook-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-meme-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-on-roblox-ghost-simulator_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/win-free-robux-robux-robux-free-new-game-order-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-codes-in-endless-treasure-quest-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-robux-roblox-hack-created-by-robuxian_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/admib-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-draw-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/https-wwwfree-robux-at-http-rex-eu5org_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/como-conseguir-robux-gratis-en-roblox-sin-hacks_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_002_off00003239.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3239 23932 bytes
SHA-256: e018882a55afbe7ddfde9422338a19182cbb02bc89dadd1eb8b69fb9d7e15bc7
font_01_sfnt_off000068bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BD 18856 bytes
SHA-256: c3ade08de57381628f5686ccf696f3ba3849ebe8fe4747e995ca261a5a4133ad

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