Malicious PDF — malware analysis report

Static analysis result for SHA-256 83459deaf3fc1206…

MALICIOUS

PDF

49.0 KB Created: 2021-06-10 13:17:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 14df30668a1cdffd1f041fbed31528cb SHA-1: 36d5293d775dd8557f0247a34e23754f2b718de2 SHA-256: 83459deaf3fc120609793dc86c66d1bd8a949f6efbc3f863593442ff4a5d567f
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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.
  • 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/roblox-robux-hack-mobile-game-hack PDF link annotation
    • https://ceranique.nl/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/mcpe_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/giving-away-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/watch-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://ceranique.nl/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/free-spin-app-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_004_off00004f15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F15 28832 bytes
SHA-256: f365168319746f81bf3746c15141e8efb4adc419c0f3941ed117d3436d4f1890
font_01_sfnt_off000091e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 2928 bytes
SHA-256: d27ca7269cc665f7c566dcba71d1fcbd1348614b7b6242da2500f0713fcbc8bc
font_02_sfnt_off00009c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C09 18636 bytes
SHA-256: 07b469f5ca797f3d7c6f8c8b9372a2c6d5d8c175631929b1a2a0cab85b1c7591

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