Malicious PDF — malware analysis report

Static analysis result for SHA-256 b687241987bf7dee…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 17:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8a897b0dba169c983dd6a06ffe567aee SHA-1: a3a40fa512dfd405b6e652169fe7054125db044d SHA-256: b687241987bf7deee20f04ec70a11b1ab7af004f17738f28920ffcd951a660fc
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/how-to-hack-coin-master-apkmody-game-hack PDF link annotation
    • http://unionmusicaldebenidorm.com/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://unionmusicaldebenidorm.com/images/coin-master-35-16-hack-apk_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_off00004a57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A57 24432 bytes
SHA-256: 62f93170d7680b155ec6ce5b4db729dd91933e1ecdef49585d3f7a233718ecd8
font_01_sfnt_off00008294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 18668 bytes
SHA-256: e7e40e6d627f7d0a582dd4caf2aeae50f8a0cca4ed14db558dd19ab499df6db9

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