Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac81a367409d19c0…

MALICIOUS

PDF

32.5 KB Created: 2021-06-29 09:38:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 67d80683c10d53500f483fa1e62169ae SHA-1: 58c8a5531a4c7c39225aa95e705f95de877f8dd8 SHA-256: ac81a367409d19c0f5720b6a46fb402a77702954d8055f0a1fb02151fbc31854
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the guise of game cheats and hacks to trick users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, including the primary malicious redirector at http://netcdn.co/app/431946152/free-roblox-cheat-codes-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for JavaScript execution or further redirection chains to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-roblox-cheat-codes-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-into-somebodys-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-installing-any-apps_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-accounts-with-robux-2021-september_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-cheat-moves_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/stella-roblox-hack-buy_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-into-anyones-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-robux-for-free-on-ipad-easy-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-jump-hack-2021_GM431946152.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
font_00_sfnt_off00002af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF0 21484 bytes
SHA-256: 52ca20b9c2ee085bcca61496ea4d9b605750f78b75beb914f0a35d6d49a65aab
font_01_sfnt_off00005a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A12 19092 bytes
SHA-256: 16166b020ec2df35b4a962e79cd36569aa39bf3e7acc02af8184b75bf679af51

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