Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dfcdd5ea55e562…

MALICIOUS

PDF

34.4 KB Created: 2021-07-01 03:50:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f221268591744c88e523d8755c2a8dd SHA-1: 14423cd61bee2a67949d40e94dee43f3e6fd6f90 SHA-256: 84dfcdd5ea55e562fb810c75ef8434c4d3faf620f3b345f17371c14c8ccc829f
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/roblox-welcome-to-bloxburg-cheat-game-hack PDF link annotation
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-noe_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-your-hacked-account-back-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/hacks-to-insert-in-roblox-console_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pubg-74-uc_GM1330123889.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-redwood-prison-hacks_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_off00002f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F40 22132 bytes
SHA-256: 994740b96bbc834d940875b65ecfdc2105ad023eaa62262ffdabddd96bb0ed9e
font_01_sfnt_off0000607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 19356 bytes
SHA-256: 6979648e0b118472ff6b35a3040ee19ad43fa9d673b9d3cd9c975fd5aa11b4f5

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