Malicious PDF — malware analysis report

Static analysis result for SHA-256 421e074c19eb723d…

MALICIOUS

PDF

32.6 KB Created: 2021-07-03 23:45:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6daa49d413ff77d8ad1d642dd87bda9c SHA-1: e6dda2171b89df5fbadebef4029e1e4f2b77f31a SHA-256: 421e074c19eb723d3ea95abc2244abd87202c6616ef1a1616a509f5b48be1531
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple heuristics indicating it is designed to lure users with promises of game hacks and free currency. It links to a redirector URL that likely leads to malicious content or phishing pages. The document body explicitly mentions 'Robux Generator' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/bux-gg-robux-free-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/how-to-make-a-3d-hack-shirt-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-scam-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-hack-mod-apk-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/i-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-codes-and-obc_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-earn-robux-for-free-2021_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_off00002a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A20 22352 bytes
SHA-256: dea70a2d75d4007eee1929c31d23b34f92d381b8b3f98027111d5aaeeadc35b4
font_01_sfnt_off00005ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA7 18716 bytes
SHA-256: ceb96bcce7201d9a7ae6d76b35bd05639ee9f0a30dad638d5074f4338692034b

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