Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5916cf79a86b0a8…

MALICIOUS

PDF

47.2 KB Created: 2021-06-04 00:14:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a24859b81c1a0eabaa0bced17b70f217 SHA-1: db0d831c420914330ee18a19679c9fe7537cd11c SHA-256: e5916cf79a86b0a8b5f5d8b3383bdf5d79e592cadbdf0b322dbb2c458069e4d4
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA 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 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/get-free-robux-generator-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-hack_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_off00004ee9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE9 25968 bytes
SHA-256: 78208d6bb51614a22a870477f9736ab8b32bde3b0a0b666f05a4f19de145bcc1
font_01_sfnt_off00008bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC2 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off00009572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9572 18344 bytes
SHA-256: 3242c4573a8204327cdf084b118e3b23cfd789fa9551ab2d205e53ac9add3c4b

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