Malicious PDF — malware analysis report

Static analysis result for SHA-256 c244997831d53429…

MALICIOUS

PDF

45.9 KB Created: 2021-05-12 19:03:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6d3157ff6fba5d6e603fefc0b5e092d5 SHA-1: ba1f3e0f5015bdda39a70f5a5b3a8bcfb8758393 SHA-256: c244997831d53429e964d602713b3b50f0dcda91fa2e27abc03fd3f7779249a0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or free generators. The primary lure identified is 'Minecraft Free Download Apk Softonic Game Hack'. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/minecraft-free-download-apk-softonic-game-hack In PDF document text
    • https://smark.com.tw/image/data/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/worst-client_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5E 25628 bytes
SHA-256: 53a725f053b18c4bbccb77fc711ad6f906c60f3c5c21e5aa87380f5e2618e575
font_01_sfnt_off000085d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D1 2976 bytes
SHA-256: f01acc160ef1393137cd7a90315dbabef2de3b2672caff7b486b43975190684a
font_02_sfnt_off0000900f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900F 18636 bytes
SHA-256: 8d59af17281decbf927120d542a9fc6958c86d48fe17fe9ad1336eeca3d2c8a1

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