Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee94ab21ebe92f8…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 11:35:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 90541d24a999276b498369693196c5f5 SHA-1: e6f41241a4371654f7bda71435f8f943ae68e716 SHA-256: cee94ab21ebe92f85089f3a7dc2ac19185aa8f8316a2353da1e6bfc043fc27a3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/app-for-free-spins-on-coin-master-game-hack PDF link annotation
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/level-coin_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/robux-free-2021_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_off000050e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E4 24740 bytes
SHA-256: e7cf035a430fbc122ad3b3f2ce00128332374f781e65a1056666f076d77dccb2
font_01_sfnt_off00008920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8920 17884 bytes
SHA-256: dc6c70fafb51a78ef12f4086d2953ccfccc8a264293bd4053977bb356e74e192

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