Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c6e2de27f0938e…

MALICIOUS

PDF

49.0 KB Created: 2021-05-19 03:36:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cbf44ca389956e6f411f98c41ed5fda1 SHA-1: 253c4578306740bb1e8a9e94daba39a4aada789b SHA-256: 58c6e2de27f0938eff2c896f7b22315db6bd7b15f8119f8f9d816b525525978f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also features a large number of external links, many of which appear to be SEO-optimized for scam-related keywords like 'robux hacks' and 'coin master spins'. The presence of these links and the fake CAPTCHA strongly suggests a phishing or scamming attempt, likely leading to further malicious downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-hacks-com-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/10-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4764 26768 bytes
SHA-256: cdcf203f72ca4d29e5ee99c6ef4811e2363442c552bc6c3048851e04cb42ee76
font_01_sfnt_off00008586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 2880 bytes
SHA-256: 106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081
font_02_sfnt_off00008f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F72 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off00009c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1A 18440 bytes
SHA-256: 1a583cd050f8f98e2431c615d76cb557f5db8d78fe9a055893f9d58d3dd3bb04

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