Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae183372987a0dc3…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 02:00:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bde8ccfd2df44c7198c67331e05ca1d3 SHA-1: 4ee1db9deed3d78448c848f149ebba7abd872e2a SHA-256: ae183372987a0dc391d45d747da5f2f80cc33333cc18ff7aa3c40dcb925c4cd2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, masquerading as game hacks and generators, which lead to a link farm. This suggests a lure to drive traffic to potentially malicious websites or phishing pages. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm, likely for SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-build-hacks-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-2021-august_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-candy-decal-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-players-in-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
font_00_sfnt_off0000334e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x334E 23108 bytes
SHA-256: 87048599b1fdd1ab104fd218a985021aa5fa7420896c09634b58320bedcdf36e
font_01_sfnt_off000066fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 18628 bytes
SHA-256: a4fd7a8a6c31dcfbd5d524261ca24fbd66144d88575524e109ec8b87e7a5b6d6

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