Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f700b38491b0604…

MALICIOUS

PDF

42.7 KB Created: 2021-05-11 07:33:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eb26df5bb460a1366fb8882c5b41c9cd SHA-1: fa70287995dcc568ad6ed9c3b58f673c26186f90 SHA-256: 1f700b38491b0604629281b16b1dd05b544dbe4f2f2b996e8a66e6bdad95c6de
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and a callback-phone (TOAD) lure. 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 6

  • 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/javascript-free-robux-game-hack.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/javascript-free-robux-game-hack PDF link annotation
    • http://e-library.akbid-purworejo.ac.id/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/minecraft_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-hack-2021_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_off00004ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD5 24484 bytes
SHA-256: 6f286db72ff33b91122f809a836790efc5ed76cf52c3039f7cf237f72308ca4d
font_01_sfnt_off0000829d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829D 18920 bytes
SHA-256: 37df68cbe6d620a6a908579d98e7a1ce8a765682fff888c408a64c9cb805dd83

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