Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1ea848360c3c81…

MALICIOUS

PDF

34.8 KB Created: 2021-06-25 22:49:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 15e4618c1d45dc4d0d84b35d105b3f73 SHA-1: 1b750513a7005b6acc096e5b03fd2d383cb5d44a SHA-256: fe1ea848360c3c8116db5217219c40dd16a338c45341dcbc99cbefa26bdda073
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/roblox-robux-hack-2021-pc-game-hack PDF link annotation
    • http://sudamericarural.org/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/can-i-get-a-hacked-roblox-account-back-without-email_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/wurst-mc_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/galactic-adidas-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/oh-no-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/martian-lettuce-coin-master-free_GM406889139.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_off00002fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE0 22508 bytes
SHA-256: 8f31e43be99269ed3578a8320cc02bfa0d0b99a3004e7030ccef1516d2798fb8
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 19352 bytes
SHA-256: eb64b16cd176b1b9ecee0052c3a104e2edcabaa4d391b79740e2fd5cc10d7d07

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