Malicious PDF — malware analysis report

Static analysis result for SHA-256 131739bf8294340a…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 17:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 01f5ff3b1d54f4d863affeeabc4bff5b SHA-1: 09432e294eecdc7994dfa0499d3ac78f966a49b5 SHA-256: 131739bf8294340a7d99d664668da1d53e002b1669c417ec86c9abd78802c173
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/robux-hack-me-game-hack. The document body and heuristics indicate a lure for game hacks or free currency, a common social engineering tactic to trick users into visiting malicious sites. The presence of multiple PDF links suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/robux-hack-me-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-roblox-gift-card-online_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/porque-no-injecta-el-hack-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-not-fo-sale-roblox-templates_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/hack-roblox-online_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-on-roblox-october-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-times-in-roblox-games_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-likes-and-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/wahoo-gaming-co-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
font_00_sfnt_off00002e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4F 21564 bytes
SHA-256: 14a2c68516f7f941a164b1bee2608b7d57d25ec63b621d0aa9c0a688c91a8795
font_01_sfnt_off00005dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 18916 bytes
SHA-256: d49e1575892b00f4a4e8cdcd45bcc6284cddefc71d3a5758140a1c9b54c8cd26

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