Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaec4b391ad0e77…

MALICIOUS

PDF

35.7 KB Created: 2021-07-02 04:25:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 33b1ee256e7573b53d5edb18d332d3c5 SHA-1: 82a2b3f370dd699f6836e41c2641a0575ed67963 SHA-256: efaec4b391ad0e77163cdbd27a0ceb2b90c39e2996928639bfc7cae3b5ea2ecd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, including one to a known malicious redirector, disguised as 'free generator / game hack' lures. The document body and heuristics indicate a strong attempt to trick users into visiting these sites, likely for credential harvesting or malware distribution. No scripts were extracted, but the embedded links are the primary threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-robux-100-works-2021-game-hack In PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-can-you-get-free-robux-on-laptop-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-generator-get-your-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-change-my-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-we-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-become-a-hacker-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/piano-keyboard-free-use-music-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-website-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-mac_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/kachifpro_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off000031f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F9 22572 bytes
SHA-256: 3e18b44a607752e8929a8b6bc8b6938dd51fad3658fcff4e610b4f6ef9730cdb
font_01_sfnt_off00006427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 19752 bytes
SHA-256: d5f3eea645423dbc25344b5a3f1256bf52283f1c3da90d8163ff448a26292604

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