Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511964f3bff5723…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 23:31:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b0966a5c8f5644fa82ea1eaf37f9ccf SHA-1: b00804d0d3bb4cd2f5fab5f8e80f3e56a682d15d SHA-256: 8511964f3bff5723f11df4461e7bcce70a27a5f1193d9336a2ce5317022cedef
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.tw/app/431946152/rbxfree-com-free-robux-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/roblox-games-to-play-for-free-now_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-unused-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-no-verifaction-or-servey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hack-unlimited-robux-robuxplus-live_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-para-roblox-en-espaol_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-for-kids-that-can-hack-it_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-exploit-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/big-booga-dig-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-on-computer-no-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-28-robux-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheat-list-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-fre-robux-just-by-join-this-group_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
font_00_sfnt_off00002f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5E 23228 bytes
SHA-256: eb9d78c66f20aa6691069e876ee03c576a896d73a5f686110402ca366f90d99f
font_01_sfnt_off000063e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 18976 bytes
SHA-256: 2aa9052e4078dfdf09f927976bfd3cf76f1a678b4d9b3ecd6888c6d9efbc292b

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