Malicious PDF — malware analysis report

Static analysis result for SHA-256 586fd79a99c9f9f8…

MALICIOUS

PDF

32.5 KB Created: 2021-07-19 20:19:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3a666f2414e16d7cbd7d1755b5eb7575 SHA-1: 3cf21490c885c5d29b089f5b8f63dce5a4318461 SHA-256: 586fd79a99c9f9f83fa6da2baf596d06dfb8fe79a14492c2f65fbe31db993dc9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game hacks or generators. The primary lure URL is http://netcdn.tw/app/431946152/how-do-u-get-free-robux-2021-game-hack, which is associated with known malicious redirectors. The document body and embedded links suggest a social engineering attempt to trick users into visiting these sites, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/how-do-u-get-free-robux-2021-game-hack In PDF document text
    • http://g3galileo.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://g3galileo.com/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://g3galileo.com/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://g3galileo.com/images/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://g3galileo.com/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://g3galileo.com/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://g3galileo.com/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://g3galileo.com/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://g3galileo.com/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://g3galileo.com/images/how-to-get-free-robux-on-ipad_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_off0000297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297B 22152 bytes
SHA-256: 736194d7391dec0684c8ac353f037a561d3715fa7c6f65b2d7d513b0542041dd
font_01_sfnt_off00005a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6B 19040 bytes
SHA-256: 14ed63897d8c38c9b74f4ae6c685ddc963b8153977262fdb6411d06658c720a7

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