Malicious PDF — malware analysis report

Static analysis result for SHA-256 851692921887eb64…

MALICIOUS

PDF

44.1 KB Created: 2021-06-13 23:24:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3dcf63c6f100571834323d60de98ef78 SHA-1: 7777706cfece6fedaa53e30086cae40ec669c1d6 SHA-256: 851692921887eb64ce3fce34270ade4fd4fb87a25615892ed3c96c76db676a12
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The ML classifier also flagged the document as malicious. The primary attack vector appears to be a social engineering lure to trick users into visiting a malicious URL, likely to download a secondary payload or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-earner-game-hack In PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/free-hat-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/free-robux-in-less-than-10-seconds_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://bisnisrakminimarket.com/ckfinder/userfiles/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1E 27096 bytes
SHA-256: 0bf18329a3a6f80c98d749cf7ba610e20b08103088bad0c4cb13db70913403d5
font_01_sfnt_off00008a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A44 18244 bytes
SHA-256: b6014a1bf70a80b5b7176295bd11553985cf3fccea183fb301f46a2e8db4226f

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