Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e2380537d601f2…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 12:32:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6df73312351f74ae2f58b087b8788897 SHA-1: aa09d5274fb49f3d3b54aa198bdea7803373a404 SHA-256: 05e2380537d601f2c85f4f6b95a9916d965d8c802da3279b6a48d5ac7e55f777
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector, that lure users with promises of game hacks and free currency. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple redirector links indicates a high likelihood of a phishing or scam attempt. No scripts were extracted from this sample.

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/431946152/robux-offers-game-hack In PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021-no-hacks_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/with-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-admin-no-download-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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3487 22612 bytes
SHA-256: a683f952b04fc53ebf4db6726e1b34db847910ae49f72d31f6a44baec11b3b05
font_01_sfnt_off00006708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6708 18552 bytes
SHA-256: f32cc96197406281b51d3b41465886517b64abaac2953e615a0f8f1f597d05ff

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