Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f45b0468c95edc4…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 05:48:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ea464b34f63697fbf96525dbaf66f875 SHA-1: 2a97337f1cd2f248b5af1bf405e15ffc3c39c191 SHA-256: 1f45b0468c95edc4c37f3aae527551e3b38803458f3de62fce554d4aabbfdc4f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, including one explicitly identified as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document is designed to trick users into visiting malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/daily-free-spins-coin-master-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pubg-uc-to-rm_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/pokemon-go-free-to-play_GM1094591345.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ede.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EDE 24840 bytes
SHA-256: dc62ee1c8c50e1cf76fb50e6b33505c183dd3dd807c8ce1afa90aa3449125191
font_01_sfnt_off00008829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8829 18308 bytes
SHA-256: 814bd0a2b88bdef89f3245e401f7fc464bd7314e61fe604409dcfddce4500050

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