Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe77d983df7191a…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 00:55:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 01e8018e1ee227a7536ef17ba29329cf SHA-1: dd700936d9fe66951b6673444ae413424a433b89 SHA-256: efe77d983df7191a4ed70feb9284339ef82d6cad942c260f3f981f1bce698f7a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free items, specifically mentioning Roblox and Minecraft. It contains numerous links to external PDFs and a primary redirector URL, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it links to known malicious redirector infrastructure and uses SEO link farming techniques. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to lead users to potentially harmful content or phishing sites.

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/best-free-roblox-items-2021-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/bunny-hop-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/dax-she-cheated-roblox-id_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-app-download-robux-genurater-on-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/meepcity-hacks-for-music-with-out-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-codes-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/starting-pilot-tutorial-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-roblox-on-iphone-6_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-hack-apk-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-tiktok-views-no-verification_GM835599320.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_off00002de3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DE3 22508 bytes
SHA-256: 27c737d7f837790b525049cd2c72300753e23831dcf77eb9ed043c29a04fdb65
font_01_sfnt_off00006051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6051 19416 bytes
SHA-256: a6214722ad3f2fc2ba9f035181d8cdcd4cbeb3aeeda8d5caf3ef83f12aff742d

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