Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d1cca1b2a2b379…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 11:03:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ed64c845c459312764ddeffc354be7cb SHA-1: 959c5f834522217a7f093a1d63040fd267e01f9d SHA-256: b5d1cca1b2a2b37961363d5a32194b92a6691970e1b8d6c8896d7ca5c1fe6898
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 0.9865

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.online/app/406889139/coin-master-hack-ios-app-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robux-free-co_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F21 24688 bytes
SHA-256: d6707e32b45f601451efcae6880fbfe1f1938c2f9a4b1b8ef70fe8ead83e6d3f
font_01_sfnt_off00008839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8839 17892 bytes
SHA-256: c18f05485291fd9dd2d982fa815b69c2a1f9afc9df9b250f8ccfc4cbb8514acf

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