Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a50548f4d10296c…

MALICIOUS

PDF

34.2 KB Created: 2021-06-27 20:10:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2cc63fafc230d4edec3d580960904a60 SHA-1: db49f5814c4de775b270780c626090841d508d1a SHA-256: 0a50548f4d10296cdabab9dff7cf52bbca5cf66a7c3d144f96f012a9773e7ff0
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.co/app/431946152/how-to-hack-roblox-passwords-download-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/ways-to-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-high-school-how-to-get-free-gear_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-on-roblox-plates-of-fate-script_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/pubg-uc-new-freepik_GM1330123889.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-best-looking-free-avatar_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-to-hacks_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-lets-party-gear-testing-speed-and-jump-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/speed-hack-download-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/flame-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-minecraft-severs_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
font_00_sfnt_off00002f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8D 21836 bytes
SHA-256: 0486299459cf8aa3cfa9b79519abcdef9006a7db1cc8ff99ed26fbf5509586c0
font_01_sfnt_off00005f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F72 19316 bytes
SHA-256: 8f62da3313b88ea13bdd19de32907c38cfb79b54f79b1c0d85c750d08e627cac

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