Malicious PDF — malware analysis report

Static analysis result for SHA-256 a509b84a8a96deda…

MALICIOUS

PDF

47.8 KB Created: 2021-06-04 00:58:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0e4a0ff29449112412488566ca8574b6 SHA-1: 36e91057a02f25472d8455ec6b6fcfb9dc966201 SHA-256: a509b84a8a96dedad5401ecc47f220188a702c58e951aefa0af7a97418717e82
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to websites offering game hacks and free currency, a common lure for phishing and malware distribution. The ML classifier strongly indicated maliciousness, and the presence of multiple related URLs reinforces this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • 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.online/app/431946152/can-i-get-robux-for-free-game-hack PDF link annotation
    • http://librarysenior.com//repository/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-prices_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/pubg-uc-digi_GM1330123889.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coin-master-coins-and-spins_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_004_off000050b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B4 31984 bytes
SHA-256: 967fa5034434ffb23cdf3409ee4af907f5483a4dfebf1135d8de5e48d7fc30c3
font_01_sfnt_off00009871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9871 18344 bytes
SHA-256: 56a64ad9af2fab004080c55c49ec35472f3c2134e95e40197be892b268dd39d5

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