Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cb403ccaced409…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 19:57:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3c006f1d855b12ac120e987bbf3c57e2 SHA-1: 8b803c08435a56e72d1418eb8a6f0b7829b252f2 SHA-256: 70cb403ccaced409def09a81337181441e1abc67c569270c70096a60be37eefb
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 0.9971

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.xyz/app/431946152/7-year-old-roblox-game-hack PDF link annotation
    • http://caraless.com/images/robux-boost_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://caraless.com/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://caraless.com/images/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://caraless.com/images/coin-master-200-spin-link_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_off000046d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46D2 24744 bytes
SHA-256: f8db4ed137498d423b10411ed670503c781af91332e4814a3d245cdd64dd8a02
font_01_sfnt_off00007f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9E 18404 bytes
SHA-256: 37225de3c02ebdb31c4d59be1a78a7ea60948fb78f91d5b0c72323347af89c0d

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