Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da4fb711f7c0ca…

MALICIOUS

PDF

32.0 KB Created: 2021-07-19 05:37:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6caa469102f998b8ed3ebd77518045cb SHA-1: 362489bb2ba80b764f4af731a814111b985922d3 SHA-256: a5da4fb711f7c0ca4d645066ddf12213d0ed153ebefa4c816a741ace8108e9a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirector infrastructure, specifically targeting users with lures for free game currency and hacks. The document body and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the PDF's structure and embedded links are indicative of a social engineering attack.

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/robux-com-free-game-hack In PDF document text
    • http://roberto-gac.org/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/daily-free-spins-for-coin-master_GM406889139.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_off00002a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5E 21928 bytes
SHA-256: 74897a1399f8c983fdb971def235e4ee3d6ee27fe8625af3d3db8f011cd1c333
font_01_sfnt_off00005a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8B 18460 bytes
SHA-256: 4a32e366c4d91d7d134c7dbb73cf2529d0f331c5de2309c0ca0f4850ac867bfa

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