Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdfec21339d13c1…

MALICIOUS

PDF

34.1 KB Created: 2021-06-20 22:23:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e8781ae779906d66bf967fc43ed39ab2 SHA-1: c9a916b0d4c25866f90c6e92db6b7389ab56e2aa SHA-256: 2fdfec21339d13c1fe2f7633103edbbabea393b9cd7e170d31a36b1ef114d74d
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/actual-free-robux-fast-game-hack PDF link annotation
    • http://bressanassessoria.com.br/images/free-robux-codes-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-hacks-safe_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-hack-in-roblox-walk-through-walls_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/my-roblox-account-got-hacked-ant_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-how-to-get-free-pets_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-robux-without-buying-it_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/colossus-legends-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-scam-game-uncopylocked_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-coins-coin-master-today_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
font_00_sfnt_off00002ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC0 22332 bytes
SHA-256: d2ca82129062bbed0d8b31165245bf4bf73bc7ef97ba4fd00ed8659e5c8ca4d4
font_01_sfnt_off00006075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 18896 bytes
SHA-256: b720f380a2fc74da1ca692a4f54e622a23a338a36ae0257f17152dda66c85154

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