Malicious PDF — malware analysis report

Static analysis result for SHA-256 f856cb150d30023c…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 14:54:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: caa7a0b9c77eabe4fd37b212ffa3d532 SHA-1: e71a2bdeb0cbecd6ec63a9f5630b582fb00c80b6 SHA-256: f856cb150d30023cc6e464f2cf5330bec9fae5a4fb82fe717aaf2099fc0ba93a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9865

Heuristics 4

  • 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/free-roblox-gamepasses-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pubg-4all-cool-20219-uc_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-boombox-games_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-unlimited-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/best-free-minecraft-hacked-client_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
stream_004_off00005058.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5058 25872 bytes
SHA-256: a2dc4f2b7cd26d4bdb4ff20fc1b16be4317cf682ee918557a42237aa464dda81
font_01_sfnt_off00008b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B80 18612 bytes
SHA-256: c8b0180ba518233ce196baebbd3f29d2d9b888157bad6dd91479d0eb6b8554e6

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