Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b4e6d955a2df7d…

MALICIOUS

PDF

36.3 KB Created: 2021-07-01 17:09:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aeb00d4123d3f83dc10991ce5d63b599 SHA-1: d5605e451d52e43d2153a2de487b75aca91b8d8a SHA-256: 79b4e6d955a2df7deb46a3ac288be3d414615fb6377e266fe811dcaa6e82223b
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-use-hack-scripts-in-roblox-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/haxteamcf-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-anything-for-free-on-roblox-2021-inspect_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/10-euro-roblox-karte-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-games-like-roblox-for-chromebook_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-money-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/adopt-me-roblox-play-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-into-any-ones-account-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-roblox-ccv3_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-vehicle-simulator-xp-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/fps-hacks-roblox-aimbot-not-pf-v21_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-into-roblox-account-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-dragon-ball-super-2-hack_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_off0000344d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x344D 23180 bytes
SHA-256: 43c62d2562f77389204828b1ef8f1496126469bdc62761fda373a3f7f29de445
font_01_sfnt_off00006846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 19220 bytes
SHA-256: aad2ba0b8e33a946c05137065f683c19afbf7492e010f83651261833587ff498

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