Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c0e4401a5f753…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 11:10:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d6ee4f355985e22cc25133c67b12f6ea SHA-1: 233997d9adf76aed44aade0ebd64ecea3d6e763f SHA-256: 557c0e4401a5f7534b23d9fbf1d5e437379d0de29a22e9ee28fe8826b84eea9b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious domain, masquerading as a game hack or generator. The ML classifier strongly indicated maliciousness. The document body and heuristics suggest a lure to a site offering 'free generator / game hack' content, which is a common phishing tactic.

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/roblox-2021-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-key-words_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/cheats-for-egg-farm-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hack-roblox-in-game_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-do-you-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-ninja-head-for-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-february-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/tiktok-free-iphone-12_GM835599320.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/dragon-ball-super-2-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-minecraft-account-generator_GM479516143.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_off00002fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE2 23216 bytes
SHA-256: b01829f26ed0644851c23fd907c1392213756f6999014a027b540719bb50f479
font_01_sfnt_off00006328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6328 18888 bytes
SHA-256: e3dfa23f69ab0be551e520ab7a19c796a58b825a7f42db5be3fdcce963c35810

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