Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c111928a1c641bc…

MALICIOUS

PDF

42.8 KB Created: 2021-05-31 03:13:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2f4e209556e42719670c5e27ff1a2220 SHA-1: 13bcc7c8b3d1a99b36ba77c81a24d2bfb0ae676b SHA-256: 1c111928a1c641bcd6f4564ed6027d83b197b4744a554c98179a01e7f6ad658a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The primary lure directs users to 'netcdn.xyz', which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at redirecting users to potentially harmful sites, likely for further malware delivery or phishing. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 4

  • 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.
  • 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/479516143/how-do-you-get-minecraft-for-free-game-hack In PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.brotherscompany.co.kr/wp-content/uploads/fsqm-files/roblox-speed-hack_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_off00004e69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E69 23984 bytes
SHA-256: a32180a0265f7abd7acd4632306be987fa325ba105065e4a98c81193b6071617
font_01_sfnt_off000084c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C1 18344 bytes
SHA-256: 67167d5a85b4e79e1ce06ee0ca4bd8624b04b02f24f28de3bf15fdadfc91d29a