Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0f878ce1afb91d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 12:51:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 50d9cb1819ebb7459b4f7cd404e1ee82 SHA-1: aa2235af772ef3ce9bb3fe01cc36f64b92a6c9ad SHA-256: 2c0f878ce1afb91d684ded525bd9ab2c898e6442e72d7bc8083820fdf8e084c4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The primary lure appears to be 'game hacks' for popular titles like Roblox and Coin Master, suggesting a scam or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, and the 'PDF_GAME_HACK_REDIRECT_LURE' confirms the deceptive nature of the content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

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.tw/app/431946152/how-to-get-hacks-on-roblox-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/codes-for-free-robux-2021-that-nowon-use_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/games-in-roblox-that-will-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/claim-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-tiktok-likes-trial_GM835599320.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_off00003022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3022 22544 bytes
SHA-256: 5216e8556624bfc0d4fca03efe347f1af4bebc4efd4bf05ac01ff39a4379412f
font_01_sfnt_off00006237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 18924 bytes
SHA-256: 8cdc80fef149013af70ce1ea380cb26237808cf67cdf225847d5804ac9d16e08

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