Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cfe3120e57adaf…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 23:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 92a5e48aad49543d142a49ad71e2f9f3 SHA-1: 65b8d06c12325f97b0d8c45cdbca040dc3205210 SHA-256: 79cfe3120e57adaf6b9d005a4703a784338dcd1e797c85de7477e169a83fd40f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and heuristics indicate a lure designed to trick users into visiting these sites, likely for further exploitation or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-no-gift-card-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-hacks-2021-augest-7th_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/slx-hack-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-hack-ohne-handynummer-und-email_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/game-on-roblox-free-items-on-the-catalog-no-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-hacks-jailbreak_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-using-codes_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3018 22668 bytes
SHA-256: c701d30b7351cfdb72745d18e7afcdfbd38c6b36fe86b7ca76e3d89f3b20ab44
font_01_sfnt_off000062bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BC 19112 bytes
SHA-256: 06df68df7bc3afc018589cc38b88bab21292ea0d667e9ea9fa060fabfca3eee6

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