Malicious PDF — malware analysis report

Static analysis result for SHA-256 f851873456537f5a…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 16:22:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cfce01b05fb49c0e080ac662dcc3e6d7 SHA-1: ac31e92656e8bcea5a555a839a469d33e588197f SHA-256: f851873456537f5a91a98db74148f40d44d122593f2ab5d776ebdc17e123831e
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 0.9865

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.tw/app/431946152/free-long-hair-roblox-codes-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/cerberus-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/pubg-uc-generator-without-verification_GM1330123889.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/tiktok-free-views-2021_GM835599320.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/pokemon-go-free-item-bag_GM1094591345.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/robux-matchcomfree-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_off00004f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F40 26272 bytes
SHA-256: 1ed66838b97a88e87d6ebdc7abf44c43feabdde73ef90dafd4e6a0650e54e880
font_01_sfnt_off00008a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A88 18756 bytes
SHA-256: 478505f327ec0daa27c394ec83fe5a5c4967ad81394a9307000ce7a35c2c5094

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