Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655f4fa0e1c292f…

MALICIOUS

PDF

34.0 KB Created: 2021-06-19 18:27:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 24dba90de201e68112f54c74278270a5 SHA-1: 17af67fc8cb4f3bf4c2a49108189163fad354c1c SHA-256: 8655f4fa0e1c292f2f99c23df73662b8fec6f81d044ba5542b993e1c86d27f95
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-get-free-robux-in-roblox-easy-and-fast-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-coolkid-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-vheicle-simulator-hacks_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-create-a-roblox-hack-in-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-roblox-bucks-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/denisdaily-free-robux-app_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/daily-free-spins-on-coin-master_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_off00002eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EED 21628 bytes
SHA-256: e46d7f8e1fb9fd45564281fc2b499560782151578c6b05769c92167ffb24d951
font_01_sfnt_off00005e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E67 19412 bytes
SHA-256: c6e5c887be6a928e3dd98e3dfd13f5d2ece2604decad3ad8baf0fffd24836050

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