Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ab5183ff07b355…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 05:55:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: db1c4699e8c6d28b44e9be07e40c53ea SHA-1: a2b895f4b046426a0627cfe68922d75e2ee3cf0d SHA-256: c1ab5183ff07b355f92c7f3704c3dfd2c43a4a34f6a7e5153134bf04ed15113b
142 Risk Score

Malware Insights

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

The PDF contains numerous links, including a primary URL pointing to a 'free Robux' generator, and a large number of other PDF links that appear to be part of a link farm. These findings, combined with the ML classifier, indicate a high likelihood of a scam or phishing attempt designed to redirect users to malicious content. No scripts were extracted, but the document's structure and content strongly suggest a lure for potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-can-you-get-free-robux-game-hack PDF link annotation
    • http://elib.acls-indonesia.com/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/roblox-free-download-apk-uptodown_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-roblox-dday-models_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/this-robux-hack-nearly-got-me-arrested_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-free-robux-in-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/roblox-aimbot-hack-v3rmillion-phantom-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/hack-kick-off-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-android_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_off00002ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD2 22880 bytes
SHA-256: f8ad99e0120aa74949383108fbeabfb66dca55ab4d1bcaa24c4036db1faabed6
font_01_sfnt_off00005e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 19144 bytes
SHA-256: 8668bba6b571f2ff0c38dc1335afffc5959d5ef775e0221b19e79d7de012f826

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