Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85a6e3370d2b589…

MALICIOUS

PDF

36.0 KB Created: 2021-07-07 10:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d085057827d9481b14ad6f50abb31412 SHA-1: 88898db3524929cfa4852d934044e8e4c055583e SHA-256: d85a6e3370d2b5896b97683320d9de73078325d61c8f4bd21e6f5414ff200abe
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/coin-master-free-spin-whatsapp-group-link-game-hack PDF link annotation
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/real-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/free-level-7-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/anti-ban-and-kick-cheat-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/how-to-hack-robux-into-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-no-download-no-survey_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/roblox-simulateur-de-vehicule-hack_GM431946152.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.man1sleman.sch.id/__statics/gudangsoal/files/roblox-play-as-guest-free_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_off000033ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EA 23500 bytes
SHA-256: fbaef1fd7f472cda2e16110ca14ea72e84890838c30f64b46fdae21db04bd5c8
font_01_sfnt_off000068b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B0 18848 bytes
SHA-256: 2c2ea5b3a51a3b352e1f4799f7252da1b365e6addc950cb05b17984e9b3d5bd7

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