Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa28cb1396b822…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 20:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4e657a156306a4347e9f5179ad95703c SHA-1: a5756cf53760bbd85d3a7f176110634091b689d4 SHA-256: d5fa28cb1396b8226e0b57fd05d1ef3f4505c25409c7cfbe79915c4060addf6b
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to pages offering free game currency or hacks. The document body explicitly mentions 'free Robux' and includes a URL that directly leads to a game hack page. This suggests a phishing or malware distribution scheme, likely using the lure of free in-game items to trick users into visiting malicious sites or downloading further payloads. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/is-it-possible-to-get-free-robux-game-hack
    • https://fib.ub.ac.id/sac/repository/how-do-you-get-free-robux-easy_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/10-dollar-roblox-card-free_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-apk_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/free-roebucks-no-human-verification_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-premium-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/robux-download_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-codes-2021-march_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-attack-hack-apk_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/minecraft-realms-free-codes_GM479516143.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-fast_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-hack-robux-and-tix-download-no-survey_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/is-it-possible-to-hack-a-roblox-account_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-autoclicker-for-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-verification_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-earn-robux-on-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/flamingo-skin-but-its-free-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/games-on-roblox-that-give-you-free-robux-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/free-robux-obby-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa4.bin
42c2b839baac32f4697a16581deea3cc05f2a25bfa77b9ca058f6b362ce8d9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 21808 bytes
font_01_sfnt_off00005f89.bin
f24a5ada971d965804af58b04ee5b9b6367f2e4ca5c866edee18a0a4d3da7d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 19168 bytes

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