Malicious PDF — malware analysis report

Static analysis result for SHA-256 a291396682e60e20…

MALICIOUS

PDF

36.7 KB Created: 2021-07-06 21:49:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7a4efdb011a522e5e0aaf1d8f7baa03d SHA-1: f9e774687fcca8f1b57b1ddb34b32e2c0f7bc3fa SHA-256: a291396682e60e202a2a16bcb81ae1ee00edd2044d270e32823b879e4f962d56
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary link, http://netcdn.tw/app/406889139/free-coins-and-spins-coin-master-game-hack, is identified as a malicious redirector. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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-coins-and-spins-coin-master-game-hack In PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/claim-gg-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-game-pass-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/hacking-roblox-trhough-coockies_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
stream_002_off0000378d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x378D 23464 bytes
SHA-256: 3373b3863da11c0c6e89e53a49a98d8431e157cb1ee0dce3cbfab4f634fa36dc
font_01_sfnt_off00006cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC1 18348 bytes
SHA-256: c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115

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