Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aa342686ca73a1…

MALICIOUS

PDF

44.0 KB Created: 2021-06-14 02:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3a66e19283b4651814d53c34b5d78187 SHA-1: 48abb69172f296b003dec3733d1d6523b31ea9c8 SHA-256: 39aa342686ca73a13ee00c152bb8a73e74dea50d6fccffa1bed81d31f58e75a0
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 0.9969

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/roblox-creepy-elevator-hack-script-game-hack PDF link annotation
    • https://koeltotaal.com/images/how-to-get-free-robux-2021-to-2021_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/roblox-hack-2021-pc_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/fly-hack-in-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-free-robux-no-hack-2021_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://koeltotaal.com/images/free-roblox-download-no-admind-password_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://koeltotaal.com/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-links-free-spins_GM406889139.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_003_off00004a0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A0C 27688 bytes
SHA-256: be0e0f8d51ee500a9a5689f141991c200718b4abbfd099ec3750fb046c19fa1a
font_01_sfnt_off00008796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8796 18876 bytes
SHA-256: 6e85cf790c81b2c9437ef60dbc244fca458d0097d914677def5be54cdf5ea41c

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