Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15c1e005894a6ec…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 00:51:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 78b2fce623a17da7eaed97c3c98fa270 SHA-1: 7822526cd5c2b99067025f7666882741ce335161 SHA-256: f15c1e005894a6ec4e8652e523c940c8a36a8987718dcbefcf535179ffc411f9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed as a link farm, with a primary lure pointing to a 'game hack' website. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's intended to drive traffic to potentially malicious or ad-filled pages. No scripts were extracted, but the overall pattern is consistent with a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/coin-master-free-spins-2021-hack-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-iphone-free_GM479516143.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_off00004f64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F64 24236 bytes
SHA-256: b6b370a72c8eec0dacc6c6ae623565138dff7a0e7ab9944672444a622d7f30b1
font_01_sfnt_off000086b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B6 18456 bytes
SHA-256: 01aac8443e047fcb7357b1b8ecb4a3fbe01c6e1da05f82155595583d2ef12cbf

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