Malicious PDF — malware analysis report

Static analysis result for SHA-256 9455a08e54f59de3…

MALICIOUS

PDF

35.5 KB Created: 2021-06-26 23:43:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 597692f513643601f93202b548841830 SHA-1: b978768f2f1f14f31879a93b1c6d1215db52c716 SHA-256: 9455a08e54f59de3023bd124e7e5827d4d1d26ddb57090ba475fd3c41fd14d44
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common lure of 'free Robux' or game hacks to entice users into clicking embedded links. The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF gateways, suggesting a link farm or redirector for malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple game hack lures points towards a phishing or scam campaign.

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.co/app/431946152/how-to-get-free-robux-hack-2021-no-scam-game-hack PDF link annotation
    • https://iear.com.tw/image/data/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/is-roblox-on-ps4-free_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/html-free-robux_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/roblox-how-to-sell-items-for-free_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/buy-robux-free_GM431946152.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
font_00_sfnt_off00003158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3158 22424 bytes
SHA-256: 82432112d38d08788017c94f1d5ef404603206d75952116403f2033c6670f320
font_01_sfnt_off00006361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6361 19816 bytes
SHA-256: b1441f7eed001da191f2b8b2719c5d4c65f09f39a5dd0875f8d2cd8c131d28f9

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