Malicious PDF — malware analysis report

Static analysis result for SHA-256 11541bda3cf2757f…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 11:59:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 27a2aa4e90095db2b9141ac15bd8a260 SHA-1: 791c65db04b6226f88f6878255218a4c982d3797 SHA-256: 11541bda3cf2757f87e29a2951811f7d836fb8616e2b1c9512e9c0c4106081cf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are SEO-optimized and point to game hack generators or free currency lures. The primary URL, 'https://netcdn.online/app/406889139/coin-master-golden-card-hack-game-hack', is a strong indicator of a phishing or malware distribution attempt. The document body, though partially corrupted, also contains this URL and references to game hacks, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.online/app/406889139/coin-master-golden-card-hack-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-denisdaily-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-for-free_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_004_off000052f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F4 26884 bytes
SHA-256: 9343035d9469dc19d7c1517c9b7ff9590b265b417b040586aca041f57bbd4391
font_01_sfnt_off0000915c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 2944 bytes
SHA-256: a0301b7f2c576e4a889a11eed4f4f7770c47239120b218cd3fd1d2cb36c2aaf5
font_02_sfnt_off00009b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B85 17964 bytes
SHA-256: adb4edbf0c57abdeeb225f0bd422abdfe2e9b1ff4eb8b752c2c204cd3e2141b0