Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b46aa75b78a209…

MALICIOUS

PDF

33.2 KB Created: 2021-07-30 10:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10fffc3ec176f972677e9569cc03ee1a SHA-1: 1e0818cd0ba9ba03fc0b2686231877f6f1f6263b SHA-256: a3b46aa75b78a209b906a5e13075576166008adb65674b980ee9788b80de17cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to external websites, including one identified as a malicious redirector. The document body and embedded links explicitly mention "Coin Master Hack" and "free generator", indicating a lure for potentially malicious content or phishing. The presence of multiple links suggests an attempt to drive traffic to potentially harmful sites.

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/coin-master-hack-without-verification-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/freer-tiktok_GM835599320.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_off00002cab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CAB 22780 bytes
SHA-256: e6b9ce39aa91fc6d58cfa0793f807b6be3c91e2e76a5b08827c0ac31449f8d4d
font_01_sfnt_off00005fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC5 18356 bytes
SHA-256: dc73d1475286564dbbcfd7fe1f785306788ee44bec01666c46f1ad38f7aa2791