Malicious PDF — malware analysis report

Static analysis result for SHA-256 f091731c7241e85a…

MALICIOUS

PDF

47.5 KB Created: 2021-05-13 10:04:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 787d5eb88fda4794b940a1eebe386736 SHA-1: 0adcf7362f47c4cd02c193241ad44c763242c328 SHA-256: f091731c7241e85adf8f2079ee8757cd608d04720435194fc5ad9b92c3431c0a
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 0.9013

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 https://netcdn.xyz/app/406889139/hack-crack-for-coin-master-currency-game-hack PDF link annotation
    • http://briankellyforcongress.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/robux-boost_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C50 26116 bytes
SHA-256: 3d06a7c418d3ef5ea031f51603e1cd191dcb945fb49a9c2f8d4ccf51ea518e54
font_01_sfnt_off00008a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A06 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off0000978d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978D 18200 bytes
SHA-256: a4065947dd7f6e5eda37ae81e5cddae0dd41603404a555eeb787a708b7a40094

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