Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c81b354503a98e…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 04:17:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 93d0f5b915368c66ddfa418c1f347d35 SHA-1: d13cfc943e35d2f2dbd6539b78a8ad580bc9bc5d SHA-256: 34c81b354503a98e8c0748aa0cc4e6fb0549688b26f40fff28959a4bbc1bd226
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed to lure users with promises of free game items and hacks, redirecting them to malicious websites. The document contains numerous links to external PDFs, many of which appear to be part of a link farm intended to improve search engine ranking for scam-related terms. The primary redirector URL is https://netcdn.tw/app/431946152/free-roblox-items-2021-game-hack, which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scamming attempt.

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/free-roblox-items-2021-game-hack In PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-rixty-robux-codes_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-roblox-account-gettet_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/videos-on-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/cheat-codes-for-grand-blox-auto-roblox_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-avatar-the-last-airbender-cheat-engine_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-red-shirt-in-roblox_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/hack-robux_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-20219_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-cheat-codes-for-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/hacker-vs-noob-vs-pro-roblox_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/how-to-hack-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/is-it-illegal-to-use-hacks-on-roblox-jailbreak-australia_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-no-scam-or-password_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/how-to-hack-and-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-2021-september_GM431946152.pdfIn PDF document text
    • https://brsolutions.pl/wp-content/uploads/fsqm-files/free-scripts-for-roblox-exploit_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_off000053d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53D5 24916 bytes
SHA-256: 4cbcc491cc27c6a5b23334dec53b5d566e51aa12655fac9d96178020de26203f
font_01_sfnt_off00008c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C45 18716 bytes
SHA-256: 4c94c87b2739836a3aba0058ec39ce59c24d0704446f252132f0dd43762bb96e

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