Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2878fac572c00ed…

MALICIOUS

PDF

48.2 KB Created: 2021-05-11 06:03:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 107e7a63cbdd7571beb996de20adf046 SHA-1: c731ba4d011aa97a5772e5dd2bd3b55a9345d379 SHA-256: e2878fac572c00ed92bb543a02be61671eed47bc0bfb8accb0132604a0b10406
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 0.9013

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.xyz/app/431946152/how-to-get-free-robux-without-email-game-hack PDF link annotation
    • http://lib.stiesultanagung.ac.id//repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD1 28072 bytes
SHA-256: 4b612d8fef8858d8831395001610f113ab4e03052ca349fb0245082cf2e0d0f1
font_01_sfnt_off00008a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3E 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000096e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E5 19328 bytes
SHA-256: 2bb545c14ce80967bc964a539ce1fba7d75b9199f0e299556cda79647f99e488

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