Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b19b2b13644250…

MALICIOUS

PDF

50.2 KB Created: 2021-06-03 23:11:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4a29acdd9c9306e040e089b3dcc9629c SHA-1: 833eb26b4283859e7fae76e27a69cf991143c954 SHA-256: 15b19b2b1364425056877824fa3a2ccf38d4a9fe2dcc92dbb8740c64b2f580af
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file 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 0.9789

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.online/app/431946152/free-robux-hack-generator-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-now_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005003.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5003 29132 bytes
SHA-256: 6b7b8677c2f4f78864192db0098f09bf60c855adbc61ee39894dcfca97e09d00
font_01_sfnt_off00009405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9405 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA117 18516 bytes
SHA-256: ac45002ee2c78c55a094f6344a5e95abe10f4ed7f4298fc77d5376065a98214b

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