Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92f48ac4793f133…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 05:18:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bb269a6903332c6fef24ff0243fea3fa SHA-1: e17f5753df98242151380a8e6d4e9ad9a9228ad6 SHA-256: c92f48ac4793f13359d0a668e778f2758665bd8cf819335c7aff7c8837a1b25c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game hacks or generators. These links lead to a redirector infrastructure, which in turn points to various PDF files hosted on 'ozkara.be', likely part of a link farm or SEO scam. The primary malicious URL identified is https://netcdn.tw/app/431946152/the-conquerors-3-roblox-hack-game-hack, which is flagged as a malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/the-conquerors-3-roblox-hack-game-hack In PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/how-to-make-a-roblox-scam-website-free_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/free-promo-codes-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/hacker-web-roblox_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/roblox-case-clicker-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/free-robux-games-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/roblox-robux-hack-apk-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/como-tener-robux-gratis-sin-hacks-facil-y-rapido-2021_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/glitch-hack-roblox_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/hack-list-for-roblox_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/roblox-high-school-life-free-steff_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/how-to-make-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/hacked-pants-roblox_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/roblox-denisdaily-shirt-free_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/how-to-get-your-hacked-roblox-account-back_GM431946152.pdfIn PDF document text
    • https://ozkara.be/wp-content/uploads/fsqm-files/roblox-blox-piece-hack-script-pastebin_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_004_off0000540d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540D 24232 bytes
SHA-256: 056c188d2967c0914ff6f0ae43b23bff2a5dfcaed93256d182c346613d9721b2
font_01_sfnt_off00008b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 18832 bytes
SHA-256: 1e69cc5c21711c051ad9c139644d068bbc018ff5f2a2692447e6fd29647f2205