Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df830e01d2953d…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 02:51:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 54366f1f230a95ae7b971a2bda7542ca SHA-1: 978b5483ad674278c28b20f475ee4cee9faa1fc5 SHA-256: 85df830e01d2953d457d21d29f6f0e42f2025de551f100f5776e219108989d39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a "free generator / game hack" which links to known malicious redirector infrastructure. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow.

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/coin-master-2021-free-spins-link-2021-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-a-free-virtual-world_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-and-bp-generator_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/huskys-roblox-obby-v4-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-naruto-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/dragon-ball-x-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-codes-for-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/game-toolbox_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-girl-shirts-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-much-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-juwelen-hack-mad-paintball-2_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-on-roblox-rap-battles_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
font_00_sfnt_off000031d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D7 22916 bytes
SHA-256: fb69ae56d3339c901f6ae627e55b161ebf79b078f1bd7444e34ec9f7ef9599dd
font_01_sfnt_off00006522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 18748 bytes
SHA-256: e86d1d7b2a315a4589de0526ea833c85a652b2f2cf198d952b17ceb10db4042d

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