Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb85b303cd6840e…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 15:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 88232364750fc52711b06e6d4e5125c0 SHA-1: c0099e4c50491333e6904c45eca8aa810149d376 SHA-256: 6eb85b303cd6840e9768b13133cfeff0909c068ead77e7b20b2ce99d51beaf44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as offers for game hacks and currency. The primary malicious URL is http://netcdn.tw/app/406889139/free-spins-coin-master-site-wwwquoracom-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-spins-coin-master-site-wwwquoracom-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pubg-uc-94fbr_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/seven-v2-roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/autoboss-roblox-free-robux-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-114-4-download_GM479516143.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_off00003206.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3206 22560 bytes
SHA-256: e28f1d422d9124f16a87e4e5115430d1eefc0702d750e227156f7758ce43ab3d
font_01_sfnt_off00006475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 19104 bytes
SHA-256: fc30aa2e2a167ce135325b7658ffcbb18d3491c1f0a21183f94466ed71bfe57d