Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d365ec06fc801f…

MALICIOUS

PDF

47.4 KB Created: 2021-06-08 17:47:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d75def65836ce92698c31893bbd2b22b SHA-1: 404b36890bc44f5464a351a72096458eb4fbe4d3 SHA-256: d3d365ec06fc801f7f549df6ecc6cdee15e0daa9a82d0c18196adacd9cbbf84c
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 0.9832

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/roblox-hacks-mod-menu-game-hack PDF link annotation
    • https://jdlgroup.ca/images/pubg-uc-kaufen_GM1330123889.pdfIn PDF document text
    • https://jdlgroup.ca/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://jdlgroup.ca/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://jdlgroup.ca/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://jdlgroup.ca/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://jdlgroup.ca/images/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://jdlgroup.ca/images/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://jdlgroup.ca/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://jdlgroup.ca/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://jdlgroup.ca/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://jdlgroup.ca/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005081.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5081 31544 bytes
SHA-256: 4d03ae1a4270274e7d16f9bb7f29f4b50a1eef26a954a3c4d8352cf3e03e0f7b
font_01_sfnt_off000095ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BA 18692 bytes
SHA-256: d5bbb83eebbebda349cde171c163cb5a739c5f7e3f48d0363d54e4a2b36dad0d

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