Malicious PDF — malware analysis report

Static analysis result for SHA-256 139b791e1e1a3015…

MALICIOUS

PDF

41.4 KB Created: 2021-05-14 13:01:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1cc4c60b0b9e23f3e9135463fcdd0da6 SHA-1: 42619bb92e9a46925b4d0805be9ac04ac9d477a2 SHA-256: 139b791e1e1a3015b6740078c3f9bc4d6af7fd9acdc2eb730c50b1930a8f1bb0
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 0.9971

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/free-spins-for-coin-master-2021-game-hack PDF link annotation
    • http://mohacad.com/images/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004864.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4864 24048 bytes
SHA-256: 2a1099edb9f868a61ef847b1fe1c0e4770fb145e41adab2cc31fe867dcc8424b
font_01_sfnt_off00007f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4D 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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