Malicious PDF — malware analysis report

Static analysis result for SHA-256 904d881aee3479c6…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 03:01:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 02aa04e1f8fb1073ce7c58a03fe2a16f SHA-1: 10c4d2bceb025d1a8de1dfd355c8243f70292751 SHA-256: 904d881aee3479c62a94dea2d7b73b230abccfe1f0d0262609b6351ef9d10797
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 0.9980

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/406889139/free-spin-coin-master-2021-game-hack PDF link annotation
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/fort-hood-texas-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-roblox-accounts-and-passwords_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/do-those-robux-hacks-work_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-no-code_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/changer-la-valeur-dun-nombre-sur-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/get-free-robux-discord-server_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-form-rbfarm_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/www-free-robux-generator-com_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-join-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-site-better-then-irobux_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-only-1-step_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_off00002f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3A 22816 bytes
SHA-256: 72b73bf5c962f78bc268cf68a0dc5a617d330fca51ea02b423c7d6725fe4052f
font_01_sfnt_off0000625c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625C 18576 bytes
SHA-256: 3af2a790f1bd7a3afb398ecfc348a5559e4db05f514a45e9361d5c46150add68

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