Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f004b6360f3fe9…

MALICIOUS

PDF

33.8 KB Created: 2021-06-30 09:44:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bb4cf3c4d9a233b140a997072d8549a8 SHA-1: f33dde0308b3fd471d58c9929eae2e783dfdf70e SHA-256: 38f004b6360f3fe9e3597f8e74c4b9e6f8bcb957e6f150cf93eea7bd25ff70ae
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, including a known malicious redirector at http://netcdn.co/app/431946152/free-domino-code-roblox-game-hack. It also functions as an SEO link farm, hosting many links to other PDF documents. The presence of a visual download button and the overall structure suggest a phishing or scam attempt to trick users into clicking malicious links.

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-domino-code-roblox-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-mods-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-clockwork-glasses-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-jailbreak-play-for-free-online_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-tiktok-followers-quick-and-easy_GM835599320.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/where-to-buy-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hackers-that-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/2021-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/ar-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-jailbreak-money-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-locked-accounts-with-obc-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-2021-easy-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-no-verification-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_off00002bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD8 22580 bytes
SHA-256: faedaaa90712f83749d083cd2dc7e62fc1a0294ae435cb95c03120113487b224
font_01_sfnt_off00005e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7F 19372 bytes
SHA-256: 943ae4e90610750bb465b34f3c91749f0d7e3ea0b7676d83976551dfbafdc5aa

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