Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5141457d8331e6b…

MALICIOUS

PDF

46.9 KB Created: 2021-06-08 17:25:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 542168ed0db51d2a1904cf78f6535812 SHA-1: 7091940d48cd17cf7ce4e4eb7f879cded63f047a SHA-256: b5141457d8331e6b00bfcc38734fd86510f1f2215281863a3e82a6314439237d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm, directing users to sites promising game-related cheats and hacks. The document body explicitly mentions 'Free Robux' and 'password', indicating a phishing or scam attempt. The presence of external URIs and a high ML classifier score strongly suggest malicious intent, likely to lead users to credential harvesting pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.
  • 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.tw/app/431946152/free-robux-that-only-needs-your-password-totally-game-hack
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/ear-free-spins-for-coin-master_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-coins-coin-master-daily_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-to-get-robux_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-hack-tool-pc-download_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-free-cards-link_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-robux-no-verification_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/download-minecraft-free-hiapphere_GM479516143.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/roblox-free-robux-codes_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-robux-codes_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/free-minecraft-mods-for-pc_GM479516143.pdf
    • http://www.goaheadmigration.com/uploaded_files/userfiles/files/roblox-hack-apk_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000559b.bin
bdd8e7a599961be2727d8a15878cdaddc98b0a72691d82e9d491c10d705493f9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x559B 25832 bytes
font_01_sfnt_off0000919b.bin
bbd31ea4fd6f829eb722e4ae93c8deb1621dbeca2fc4bf196a7587250aba73a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919B 19420 bytes

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