Malicious PDF — malware analysis report

Static analysis result for SHA-256 66499ecfdad05d1c…

MALICIOUS

PDF

34.2 KB Created: 2021-06-19 20:20:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 05263cd728bab1c567f007028c73725f SHA-1: 89ba037a415db30edbc6eefb016e9e11deeeb6a0 SHA-256: 66499ecfdad05d1c6aad3e1de532642c2ef189cd0d5cc6265f7f65b8e707453c
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.co/app/431946152/who-to-get-free-robux-on-roblox-game-hack PDF link annotation
    • http://casabea.de/images/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/cant-open-cheat-engine-with-roblox_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/how-to-hack-a-megavore-in-dino-sim-roblox_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/how-to-get-anything-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/pokemon-go-free-coins-promo-code_GM1094591345.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/hack-avatar_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://casabea.de/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/minecraft-pocket-edition-free-download_GM479516143.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
font_00_sfnt_off00002e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E59 22228 bytes
SHA-256: 206ac4d92bd9f244189bd172041737c3fa29680880a3748def448dad764fb049
font_01_sfnt_off00005fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCD 19260 bytes
SHA-256: 57c28d6785e61551af652dbb4072502181a95625180d7a38be3e3de008f9cb44

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