Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ab622aef5ff385…

MALICIOUS

PDF

32.2 KB Created: 2021-07-04 00:12:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e43f7cea04212be33aeff041bea0d373 SHA-1: 2e2f781d58f2a2f1536cecfeb874a50c335cb754 SHA-256: b4ab622aef5ff3855102fd3b10e4a4edeabbe436a18364f88259f2259b27314e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of links to external websites, many of which are SEO-optimized PDFs related to game hacks and free currency. The primary lure appears to be 'free generator / game hack' content, indicating a likely scam or phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful sites.

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 http://netcdn.tw/app/479516143/hacker-minecraft-song-game-hack PDF link annotation
    • http://gazelletr.com/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/roblox-hack-apk-for-pc_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/master-coins-free_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C14 21732 bytes
SHA-256: e6bf0edc54581a269342795c73d81cf953fed7a976e1f4439b8b577bfc6655e3
font_01_sfnt_off00005b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B51 18168 bytes
SHA-256: 37e3c409e679a213a10e0592b8ff177cf348fa9834d19b03b17241e7ed0c948b

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