Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b793cfd56cd74…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 10:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d2c7cbb550ec54e1a6739302d9495715 SHA-1: c7b7fdac83c67304701ff9ae45f2fdc003877399 SHA-256: f83b793cfd56cd74bcd03dc8a498640a59735696272d9d9be0e9b80e8d13f071
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on 'free generator' or 'game hack' content, which redirects to malicious infrastructure. The document body and heuristics indicate a social engineering attempt to trick users into installing software or visiting malicious sites, likely as a precursor to malware delivery or credential theft. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.xyz/app/431946152/google-how-do-you-get-robux-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/wurst_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/huskybuckscom-free-robux_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
stream_003_off0000497a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x497A 25360 bytes
SHA-256: a7ba279cff7578fe67480e8acbbf7be1fb3dde32534fbeccc1bd91e0778e5972
font_01_sfnt_off000083c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C5 18812 bytes
SHA-256: feb1a9118afec68bc04581c8785d3317eaa63f31aad7b08e8712898c0d5a9a77

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