Malicious PDF — malware analysis report

Static analysis result for SHA-256 d701b910221e2339…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 23:42:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5160156b66bf43ce470178ae7f7ef401 SHA-1: 2fd7ea51a77722fef54063345f31249eb451062d SHA-256: d701b910221e2339b32927d20399e8672ee391377e06fe5ca1182de23e49ce42
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.tw/app/406889139/free-spin-coin-master-link-download-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-catalog-heaven-best-weapons-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-draw-2-roblox-save_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-do-i-earn-robux_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_off000032ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AC 22900 bytes
SHA-256: 0a6d72f2b9cf4797783a8669f57add67389107a0d2f890b0fe3216f66a905b54
font_01_sfnt_off0000661d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661D 18924 bytes
SHA-256: 03306dc9e1d9b52221a0aa79eae91509ea9ef63d9a812f23220c627d140f216f

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