Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2437cc31fab6f6…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 20:53:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 32e1f7039b546fd3888929e82f53a7ce SHA-1: baa4efb31fc5ba5aaae5292dd8e7a705dc125f8c SHA-256: bf2437cc31fab6f6a3923551cf99e6e3bf12a05fde7f3b666721cefef93c4445
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks. The primary URL, http://netcdn.co/app/431946152/muffin-combat-hack-roblox-pastebin-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting these sites, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/muffin-combat-hack-roblox-pastebin-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-in-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-without-sever_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/add-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/games-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-git-free-privert-servers-in-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-fames_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pokemon-go-free-avatar-items_GM1094591345.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/gain-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-youtube-denis_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-download-jaleco_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hacka-roblox-account_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-what-day-is-restaurant-tycoon-2-coming-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/shirt-ash-on-roblox-free-on-shirt-free7_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn 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_002_off00003071.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3071 22628 bytes
SHA-256: ecea1ccd3a41811f01d493f739363b22e27a7f4a0cfd0aee3f30e4f61e50b611
font_01_sfnt_off000062db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DB 19632 bytes
SHA-256: 54684b68eacbc13efadd2c84054d936082c9db91a379ac87444d5286eabf80a7

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