Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1c24311f686d1a…

MALICIOUS

PDF

32.3 KB Created: 2021-07-20 19:42:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6d4bae7712e86bfaad7dbc0131f65787 SHA-1: 0f3e14cfaca69afc001ee7e7167db9b0d31e7880 SHA-256: fe1c24311f686d1ad533b9a0881e833bb63334101913c97dcefbbad3440620aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that point to known malicious redirectors and infrastructure, disguised as "free generator" or "game hack" lures. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites.

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/free-robux-websites-that-actually-work-game-hack In PDF document text
    • http://roberto-gac.org/images/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-java-free_GM479516143.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_off00002773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2773 22296 bytes
SHA-256: 4f72344a2ee21cabbd23ce58a62e09aeec0a09bd89f48920900ba9a77b278460
font_01_sfnt_off000058cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58CD 19440 bytes
SHA-256: 6ca5a42b15f03ce8f0527a9b99e2a0be619c538984e0635b30c2c3344ed7d0ad

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