Malicious PDF — malware analysis report

Static analysis result for SHA-256 2301c406a301a543…

MALICIOUS

PDF

33.2 KB Created: 2021-07-19 14:55:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a4ca612560273a6d157e644313c82da SHA-1: d9541a77c0ad05edc5662b58cb2921e81bc8696d SHA-256: 2301c406a301a543bc82963cd8feb8e09985bbfc7cf34c82bfc0f9ae65444241
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator" or "game hack" lures. The document body and embedded links suggest a scam aimed at tricking users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/406889139/free-coins-on-coin-master-game-hack In PDF document text
    • http://colsaf.co/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://colsaf.co/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/how-to-get-free-robux-without-verification-or-surveys_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
stream_002_off00002c1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C1F 23568 bytes
SHA-256: 1c9fe4efe8188a03962a2e9fe4935c356246d94c69cd2b896a0bc3ce0179e331
font_01_sfnt_off00006165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6165 17712 bytes
SHA-256: 6ea46f87f2167b805a87cbef3ad9b5ecf4d2513d7b8c5fe933be1d22f28e2546