Malicious PDF — malware analysis report

Static analysis result for SHA-256 331753c6590a27f1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-08 19:06:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4766589140230debc2a43d4d890f88db SHA-1: 93290148b16ce35a871696f947fbab3fbffed888 SHA-256: 331753c6590a27f17a8d3ec6def4c6c6319a877cd7bb20e45f2a74e9a8e11cd2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document exhibits characteristics of an advance-fee scam, using lures related to game currency and hacks to entice users. It contains an embedded URI pointing to a suspicious domain, likely intended to host or redirect to a malicious payload. The document's structure and embedded URL suggest it is part of a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/inf-currency-in-roblox-games-hack-game-hack
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-builders-club-free_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-wurst_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-rape-hack_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-spins-coin-master-hack_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-spin-and-daily-news-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-free-spins-no-survey_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-hack-no-verification-2021_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-free-gifts_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-hack-link-2021_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/pubg-uc-to-usd_GM1330123889.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-com-games-referrer-roblox-player_GM431946152.pdf
    • https://rblx.land
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054b9.bin
1edc774fb196383ca0e70ad4711961bb3d77f559d73e920111ab3b238fe11059		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B9 26728 bytes
font_01_sfnt_off00009237.bin
c83fe090047a263af5b85eb9a93a5e2e5b0fca304afbbf340d9e9d6fb2b3b9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9237 18760 bytes

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