Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c574a0d7451f765…

MALICIOUS

PDF

36.9 KB Created: 2021-07-05 12:26:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4458cf9024317b00b59fef39271a1ee7 SHA-1: c8ff6a9e3b4d3f0cba9c8a54411d93c3cdcf3e19 SHA-256: 5c574a0d7451f765d92d6757921e4330b5fdeb4789840020846d24fd236088db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary URL, http://netcdn.tw/app/406889139/free-coin-master-spins-no-human-verification-game-hack, is identified as a lure for game hacks and exploits. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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-coin-master-spins-no-human-verification-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/v3rmillion-free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-c4d-lightroom_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-promo-codes-june-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-hack-robux-420-apk-az_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/fre-robux-generetor_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-in-roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/bloxawards-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-paste-data_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D2 22252 bytes
SHA-256: 8d2de8620f7d27949ac624910e94457ba9e9c269c667934161797bf926ffcfe0
font_01_sfnt_off00006252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6252 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 18708 bytes
SHA-256: c7f92a388584b93aa789012e3279a4b9f567133a27d6099686bb264b3904500a