Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a51b6158bbfe01…

MALICIOUS

PDF

33.0 KB Created: 2021-07-04 06:27:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6c708242b8dad24174f33d99b3824c69 SHA-1: aae9b738b57cbd95e054087811b9bfa8033157da SHA-256: 12a51b6158bbfe014869139237ee46507a924d2ebad2dbfeb7ae242991693cf8
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/431946152/hacks-to-get-free-robux-game-hack PDF link annotation
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-roblox-pour-rcupe-nos-compte_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-robux-for-free-insetently_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-script-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-doge_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-no-surveys-or-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-cheats-prison-life_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-roblox-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-monster_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/is-free-robux-illegal_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-fast-and-easy_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_off00002d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D36 21448 bytes
SHA-256: 2815b0069b5c7f44b20bdb2fb4bfbe7e0b96306a0a725caca1383bc14e4a0dd7
font_01_sfnt_off00005be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE4 18992 bytes
SHA-256: a46b776bb67c7b468de6bb210db8cc3c07a9aad6d9a2155761eaac94cf23c7ac

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