Malicious PDF — malware analysis report

Static analysis result for SHA-256 3536965edc35ec1f…

MALICIOUS

PDF

47.9 KB Created: 2021-06-08 00:19:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb60ac18ac21824bcc52d2fdd52d70ac SHA-1: 5a40d6e8d71a7f0a5b2844a75348d30ea0942937 SHA-256: 3536965edc35ec1f5d3248fdc65893ac4f6f5c11987043c1da21a43a9e0620e7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a visible call-to-action, disguised as a lure for free Robux and game hacks. The heuristic 'PDF_CAPTCHA_LINK_LURE' indicates invisible links pointing to CAPTCHA-themed lures, suggesting a phishing or scam attempt. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-2021-working-game-hack, which likely serves as the initial landing page for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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-robux-2021-working-game-hack PDF link annotation
    • https://ogm-goettingen.de/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-robux-no-captcha_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/paypal-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50EE 25896 bytes
SHA-256: 357d2faa56db4946e4e31297c3c2d43dd792acfed7b979a0f6d0169d7fb783a0
font_01_sfnt_off00008bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off0000959d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x959D 19192 bytes
SHA-256: 067efc7014c37350089e6c1ea281f37a9378bd557d56e662dbfa5817eebd780c