Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5e4ade313fde6f…

MALICIOUS

PDF

44.3 KB Created: 2021-05-12 03:02:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5a950cf945d9a4fa8729bba6891ade47 SHA-1: 232210f40c4eb2857cba2fb6883dbee50ed7ee8f SHA-256: ca5e4ade313fde6f9bf30bc43ed6b3c2e217f861c9926b3bc9d2f7b40bb47802
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 0.9980

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-homepage-game-hack PDF link annotation
    • http://brusivojimi.com/images/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://brusivojimi.com/images/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/robux-online_GM431946152.pdfIn PDF document text
    • http://brusivojimi.com/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://brusivojimi.com/images/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://brusivojimi.com/images/free-minecraft-texture-packs-java_GM479516143.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_off00004a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A43 30200 bytes
SHA-256: 18a2047524670258960b5c6054d136e38df760a2ffeccfd192966734626250bd
font_01_sfnt_off00008ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACE 18272 bytes
SHA-256: 52ebbe1a6e32e78051c45f89c5d9c36e23c607fff486e02539fc8f460cac04ef

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