Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b27d4cd2f5b2ff1…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 02:04:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: de4c3adea72bc22be3ab573feb535acd SHA-1: a9dc8bfcd0b03cc3ade1a8e02f9e97d6eaaf96c4 SHA-256: 6b27d4cd2f5b2ff15897c127043f393329651426b0b1fe0b1f8fa8b77b09db4f
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

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.co/app/431946152/how-to-hack-roblox-money-2021-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/https-roblox-free-robux-web-wordpress-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/reddit-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-explorer-up-on-roblox-hack-v3rmillion_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/kick-from-roblox-after-open-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-free-robux-instantly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-speed-hack-btools-12042021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-survey-no-download-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_off00003018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3018 22076 bytes
SHA-256: 9558ff9be602c35649ddd8d35f6cc6d6e8331d5e97c7521b25f3f6d54149c499
font_01_sfnt_off0000611a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 19600 bytes
SHA-256: e3c740d44148d87b618ef556724bf3e4135c9d5cc0c12707a78a30454f0d6eaf

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