Malicious PDF — malware analysis report

Static analysis result for SHA-256 c122cfa15858bdbf…

MALICIOUS

PDF

34.5 KB Created: 2021-07-02 04:11:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 12d8579f32e9fc7ebe1a1ae2c150505d SHA-1: e831b0758940cb44573ec44091324d6b99f18875 SHA-256: c122cfa15858bdbf548d4819658fcef4022a347e8cfed6a4dcc4b11fbd45ff67
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links and references to "free Robux" and game hacks, indicating a lure-based attack. The heuristic firings, particularly PDF_SEO_LINK_FARM and PDF_GAME_HACK_REDIRECT_LURE, strongly suggest this is a scam designed to redirect users to malicious websites. The ML classifier also flagged the document with high confidence.

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/free-robux-generator-2021-no-human-verification-game-hack PDF link annotation
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/all-ways-to-use-cheat-engine-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/download-phantom-forces-roblox-aimbot-hack-script-2021_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-roblox-promo-codes-september-2021_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-robux-website-real-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/roblox-but_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-candy-20-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-free-pet-food_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_off00002f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F84 21808 bytes
SHA-256: 9e8d70be1739cb8e109cec5607c21a83949028c77fe674a719ee766b8b09f4f4
font_01_sfnt_off00005fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 19736 bytes
SHA-256: 842769e1722e9f6a6dfe5a27e85c9a38f967b8daf4b669e4c6c0cbecd9d850af

Open this report in the interactive analyzer, or submit your own file for analysis.