Malicious PDF — malware analysis report

Static analysis result for SHA-256 40639db50069e005…

MALICIOUS

PDF

45.3 KB Created: 2021-05-11 14:58:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3a7c484ebf27fa6e66d979a4375c496a SHA-1: da9da42b42796dafa0a77b186cbb9b66a3cd485b SHA-256: 40639db50069e005bb2033c3763db2618daebe2b8ad3e2239a9155d1a5d960c5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as game hacks or generators. The primary lure appears to be related to 'Coin Master' and 'Roblox' cheats. The document body and heuristics indicate a link farm designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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.xyz/app/406889139/coin-master-exchange-40-free-spins-game-hack PDF link annotation
    • http://algierimasonry.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/get-robux-today_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/roblox-source_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/free-coins-for-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_off00004821.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4821 25316 bytes
SHA-256: f86c1109300b2a8079f6f7434c18105b0e5d77bcf1f8b6fc37196c7a8141e72c
font_01_sfnt_off0000804d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804D 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00008cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD3 18784 bytes
SHA-256: 02a21a8f4d043716a383ca2a996404ae5ffd223ec109726667024d192b61d1da

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