Malicious PDF — malware analysis report

Static analysis result for SHA-256 344808a279383aa5…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 08:31:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cff9918637c4edd2fe5511ab5976357d SHA-1: efc492865ccb4879ded5968eff975010c9ff98de SHA-256: 344808a279383aa5207bd8addb469f3ebe320262e0427ee614c46a1d62d0276d
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 0.9971

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/431946152/how-to-get-free-robux-on-roblox-2021-game-hack PDF link annotation
    • http://opac.akafarma-aceh.ac.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/freerobux-hack-us_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_003_off00004872.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4872 25048 bytes
SHA-256: 79ff37eb605dd4398360ea5759cd278301a7ec2257760c662366bad4872c51fb
font_01_sfnt_off0000824b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824B 18756 bytes
SHA-256: 57ee29ca2df633c9559bea9da81b447a7ef2e0dffb4d388bdd233aaad46b31ec

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