Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c9862fa1a3401…

MALICIOUS

PDF

34.7 KB Created: 2021-07-02 00:52:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e8c33063adfc4dcd1997d42073146466 SHA-1: 16eb3cfb1adf7ff6c38ccd68b4e3c0831c47aaa9 SHA-256: a19c9862fa1a3401935c2d0016aa1a714d70c6c1301cf243a160389bfdf3c19c
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 0.9980

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/hack-in-roblox-that-everyone-can-see-game-hack PDF link annotation
    • http://perpus.polbitrada.ac.id/repository/roblox-free-shirt-template-with-neck_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/are-there-any-roblox-games-that-have-a-free-radio_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/descargar-roblox-hack-version-2385-apk_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-4all-cool-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/qtx-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/online-roblox-free-play_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/bird-set-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/why-free-robux-scams-suck_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-how-to-hack-ultimate-driving-with-cheat-engine-64_GM431946152.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_off00002fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC0 22424 bytes
SHA-256: ef66cd6f5dbe9930a9cd625a0b2d0642436b921e5250bcc9ea124fa3928510a3
font_01_sfnt_off000061f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 19220 bytes
SHA-256: 4b92f79c67eb74c145ec7f2b70131be4d52b0c4c2e26dccb92b9c4c83a3e65ca

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