Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1c81a4e689eed7…

MALICIOUS

PDF

46.4 KB Created: 2021-06-13 21:44:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d28de39e65fad1e6bb709779324b2f86 SHA-1: b7b835977b958c6b406c7426394e2e02b93837b8 SHA-256: 8a1c81a4e689eed7f09cf34ba4abf2b132df07ee27cd87a097465214617adc12
142 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, specifically a fake CAPTCHA or human verification prompt designed to trick users into interacting with malicious links. The document contains a large number of external links, many of which point to SEO-optimized PDF files on the 'io24.com.ar' domain, suggesting a link farm or content-spamming operation. The primary URL 'http://netcdn.co/app/431946152/i-am-hacking-roblox-high-jump-game-hack' and the numerous links on 'io24.com.ar' are the highest priority IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 http://netcdn.co/app/431946152/i-am-hacking-roblox-high-jump-game-hack PDF link annotation
    • http://io24.com.ar/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/robux-pastebin-hack-no-waiting_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-shirts-on-roblox-without-bc_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-no-human-verification-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/free-spins-and-coins-on-coin-master_GM406889139.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_003_off0000483b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483B 27412 bytes
SHA-256: c6cc6fde527189e5129c8fd0f71aba8dd7d9a72d4b43ba8fe0057ccc85dbf83f
font_01_sfnt_off00008572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8572 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5D 19496 bytes
SHA-256: a2704f6333bf152cbc511b0ae86cf9cd9e726ec43199deb7644424fafc53f5c6

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