Malicious PDF — malware analysis report

Static analysis result for SHA-256 153136668736999b…

MALICIOUS

PDF

47.2 KB Created: 2021-06-09 12:39:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5aa92585a1b23e5d8686158237a7d98b SHA-1: 03dff272098e704c5f3d719527f6566a4ca6e9a5 SHA-256: 153136668736999bdbd2beddb4b738c40f331e6739433e5661af2b4ebbd81cf0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The primary lure appears to be related to game hacks and free in-game items for popular games like Roblox and Coin Master. The embedded links likely lead to malicious sites designed to distribute malware or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/roblox-game-app-for-free-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-hack-no-on-roblox-email-or-no-password_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-accounts-with-builders-club-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/tiktok-free-followers-2021_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/backpacking-hack-roblox-v3rmillion_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-promo-codes-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-hacks-2021-free-robx_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005215.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5215 24764 bytes
SHA-256: c4608b61104009878cb8e542f67a65da9ebe60c11162597a4c258d03b9007229
font_01_sfnt_off00008b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B34 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000094e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 18612 bytes
SHA-256: 47d09630511dec20ee17ef62065d2f101e3442320136b8053a9dca3a6f6284f1

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