Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf03cb441244c3d…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 06:17:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 902cbed8ad7915e88a82003663ce766c SHA-1: 955126c042d961cfaefcc5b635070a78f9c4ed13 SHA-256: adf03cb441244c3d65f9d0ce72fcdd5d4a3acf00384cdb99de016dcd9d4fe744
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 0.9865

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 https://netcdn.online/app/406889139/coin-master-cheat-codes-free-game-hack PDF link annotation
    • http://biblioteca.ganexa.edu.pa/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/hack-coin-master-without-human-verification_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
stream_004_off00005127.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5127 25144 bytes
SHA-256: 8108b942082c8fb120b343ad6123b9e2edcc585ed6391cb806851453093e0f5d
font_01_sfnt_off00008b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2F 18052 bytes
SHA-256: e1f7dc216c669c22560805cc0a50cb8b77f141bfe6c38f33d25df223dbe053b5

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