Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca355cf77c95a14…

MALICIOUS

PDF

36.0 KB Created: 2021-07-06 18:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 08ebdca12254a7e365de0dafb0c0794b SHA-1: 9e84b1583eab1e0b4a161b4a933f366dcc350c75 SHA-256: bca355cf77c95a14a8ebf0943ad3ddfa4c0b1c07a435653683fe675183cab303
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or free currency generators for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO manipulation tactic. The primary lure URL, http://netcdn.tw/app/406889139/coin-master-daily-free-spins-25-game-hack, likely leads to a malicious download or phishing page. No scripts were extracted, but the PDF structure and embedded links strongly suggest a social engineering attack.

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/coin-master-daily-free-spins-25-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/blocks-of-war-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/can-you-use-cheat-engine-with-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-items-on-roblox-may-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/but-link-says-free-robux-walter_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-biggest-hacks-ever-top-10_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-twisted-murderer-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robux-free-join-group_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/can-i-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/pubg-uc-hack-season-9_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-o-get-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/5-games-that-give-out-free-robux_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
stream_002_off00003469.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3469 23048 bytes
SHA-256: b3926de90961b7fbdef7092b3dfda550000c1518383f47a9b408b2e74afcaa47
font_01_sfnt_off0000682a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 18852 bytes
SHA-256: a487ce0000d3ce43933202f3692ca7cb45ea3e63696d23cb31952fc5e806c807

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