Malicious PDF — malware analysis report

Static analysis result for SHA-256 653915da1f54fe5b…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 21:08:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 08e38858e7cbb1c9a51a1afb52658196 SHA-1: 6683e504127e23e2eb0148cf28243a16416b48e5 SHA-256: 653915da1f54fe5bcd5cf395918b486e2506efc5c8d4ae3650d339e609c5be11
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF contains a high-confidence lure impersonating Amazon and directing users to a "free generator / game hack" URL. This is a common tactic for credential phishing or leading users to download further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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: https://netcdn.xyz/app/431946152/roblox-premium-free-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 https://netcdn.xyz/app/431946152/roblox-premium-free-game-hack PDF link annotation
    • http://perpus.sdmtenggarong.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://perpus.sdmtenggarong.sch.id/repository/robux-com-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
stream_003_off0000492e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492E 24592 bytes
SHA-256: 1caa098f420ffe55b7257b7ee0a89e4d0c23630fa1b4953baa9da63162a96d61
font_01_sfnt_off000081f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F2 18620 bytes
SHA-256: 29b072d58d5b3a55b665a3fffae90f40690866f16f9b518bc51084b043f759b6

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