Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eff47886ef4dccd…

MALICIOUS

PDF

47.9 KB Created: 2021-06-07 13:13:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c92c337b9716874cba8f7d743738f021 SHA-1: 1d41ec4e0ef26715a02a308b5a77f7a9dbee865e SHA-256: 3eff47886ef4dccdc440241a36f188e2d289004184ef1b1c00207b5badb9a6e1
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 0.9796

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.tw/app/431946152/cheat-jailbreak-roblox-fr-game-hack PDF link annotation
    • http://sv-nahetal.de/images/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-daily-spins-coin-master-2021_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_004_off00005011.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5011 25708 bytes
SHA-256: 9cfa4fb10a8eba01cd3348a3dbd84e8b183c64f293f1299687dbef614d8f0c74
font_01_sfnt_off000089c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C9 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off000096f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F0 18900 bytes
SHA-256: 54a90205a5dda8051d92da631495a02e4c4f31e45aeafec4e871d952fabefac0

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