Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c43ee8cda3b624…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 10:15:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fcd53bf67085870092e7123d58d222d5 SHA-1: 27b3dc61aa0589f11ec5bf1c8e55d5188cbfcc30 SHA-256: 28c43ee8cda3b624f45257531f255e78aca3dff612147bd7be1331f0d7470c73
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9969

Heuristics 4

  • 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/free-robux-generator-codes-game-hack PDF link annotation
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/coin-master-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/mathep_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/master-coin-free-spin_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_003_off00004b77.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B77 26492 bytes
SHA-256: 4aaf94671d566ebde4485894571ad127395588798b4d7be84b1eb462f8a93383
font_01_sfnt_off000086c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C1 18520 bytes
SHA-256: a3c42500ab941ca6b3cc9f1b186676fd5f7f9f0c0249e27b539405b68f11e4ed

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