Malicious PDF — malware analysis report

Static analysis result for SHA-256 f511f39e422fde83…

MALICIOUS

PDF

42.7 KB Created: 2021-06-14 02:10:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75379ca7d798769707709c6bfac24a31 SHA-1: 1315c5326ede1f1be128e8a0205b66410c4cb58f SHA-256: f511f39e422fde83c51bb5d4fa49cbb8f8d31d8a4037ed83e6d02736c8c590d4
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9971

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/free-roblox-promo-codes-2021-may-game-hack.
  • 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.co/app/431946152/free-roblox-promo-codes-2021-may-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-2021-ipad_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-2021-april_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/robux-generator-unlimited-hacks_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-zone-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/no-virus-roblox-hack-xbox-one_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/apps-for-free-spins-on-coin-master_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
font_00_sfnt_off000047d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47D2 24688 bytes
SHA-256: c6c66437556119eab38e49ec5730e4eb17de2016c6e2c89e1df68f1a8c6f414b
font_01_sfnt_off0000803c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 19728 bytes
SHA-256: f917fd0a3180c4d7d9769449a11b6693911806588dddcfd39107263cce318afe

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