Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c5e01e0e0db3d2…

MALICIOUS

PDF

47.1 KB Created: 2021-05-17 07:44:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 586d154c6ad21b149ca537197ec3246d SHA-1: 4441ab9ff894d0e9c4ad96cf9ff8efb21b2478f3 SHA-256: a5c5e01e0e0db3d296df921f9541f66a3bdeb34a792ea10978f4bfe2f3ea2f0d
142 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and requests recovery secrets, strongly indicating a phishing or credential harvesting attempt. The embedded URLs and document body content promote 'free Robux' and game hacks, serving as a lure to trick users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a malicious workflow designed to exploit user interest in free in-game currency or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/how-to-get-free-robux-without-paying-game-hack PDF link annotation
    • http://cablelinkcoms.com.au/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/inappropriate-roblox_GM431946152.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_off0000474f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x474F 26860 bytes
SHA-256: fe29f929ffadca3d56df650ccc72493263ebc7cc95fb72aa0bab7d8511a48503
font_01_sfnt_off00008445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8445 5756 bytes
SHA-256: a7a69a356750c58f853193ac64834dcf3e4080fc2a8f6e9107645a696c81e11e
font_02_sfnt_off00009197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9197 19616 bytes
SHA-256: cf429e2e91354d73b6f0728fc312d6ff4bad20be80a5ba6db32adcb01c969c4a

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