Malicious PDF — malware analysis report

Static analysis result for SHA-256 0356be05620bbc4f…

MALICIOUS

PDF

42.7 KB Created: 2021-05-18 01:07:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0a730b41988150dee375801a8249a9a3 SHA-1: c991fa4b99024b4c0b5da5ccca87b6a96cdcdabf SHA-256: 0356be05620bbc4f28979fe205213a422000691969c739e5fd292682dd289c71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as offers for free game-related content. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded URLs point towards a lure for users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/479516143/free-minecraft-codes-game-hack In PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/www-robux-com_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-coins_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_003_off00004d9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9F 24888 bytes
SHA-256: 0ed58ae8b84807c921463508db96f037d294c63f8c7e424bd8676945162e4471
font_01_sfnt_off000085d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D0 17884 bytes
SHA-256: ca0982e5699fcbbad1c272e9f6df792bd17b0fef580afa6f1747d77cedc77eee

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