Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf39a9a0e2355f1c…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 02:26:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7fb1d1a11384f9307b3cfa9ef8dec7ec SHA-1: 502df6d697981605645d44796405f62a87644f47 SHA-256: bf39a9a0e2355f1cc31d5437f155d4ace8cf7220ae1fccbb86c13f1ef4b63703
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is designed as a lure, employing a 'free generator / game hack' theme to entice users. It contains a mass of external links, primarily pointing to other PDF documents hosted on 'digilib.stimata.ac.id', which likely serve as a link farm. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spin-coin-master-link-today-game-hack, which likely leads to further malicious content or scams.

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/free-spin-coin-master-link-today-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/how-to-exploit-on-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-how-to-save-movies-for-free-roblox-action_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/comment-hacker-jailbreak-sur-roblox-2021-mops-games_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-limiteds-roblox_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_off00002db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB2 22316 bytes
SHA-256: 8773819a8adc00d1ba2808be8ff73f732ebc55513c0f4980c435dffe46118d92
font_01_sfnt_off00005f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9A 18696 bytes
SHA-256: 999ecdd706d19f0427b49ef661b374c0ed01ce3167435dc1c975e4b6691a93c3