Malicious PDF — malware analysis report

Static analysis result for SHA-256 2643847abd388ef1…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 11:49:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a1fe81bffbb82d3fb8c311540b1487a8 SHA-1: 0f84fbd5eb44f8d7528c72c2aa7da64c9f818c15 SHA-256: 2643847abd388ef1b1fd47e4302edcf1a6607886bc1f2c959d8c1bff550b5ab1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appear to be free game-related resources. These links redirect to a malicious domain that hosts a large number of SEO-optimized PDF files, likely intended to drive traffic or distribute further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.tw/app/431946152/keyword-free-robux-game-hack In PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/how-to-hack-coin-master-ios-no-jailbreak_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
stream_004_off00005417.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5417 25700 bytes
SHA-256: d9ceb36ef6cd3804658e4ddab4c2b3faa6af208722379418723fc62fe9714f74
font_01_sfnt_off00008fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBF 18532 bytes
SHA-256: c6b6016cc59dcb45405b8e5db890beb8270611d22f4427f46e7b4254bf82e606

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