Malicious PDF — malware analysis report

Static analysis result for SHA-256 838b189320deac73…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 03:09:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6593bea097fb575d9e4aa3e5e8bfa161 SHA-1: a9cbc824704e2423e19877d29a5b68b0b3bd333e SHA-256: 838b189320deac730499392c48bf396e0cc564e0616a0079e4d563ecc981e641
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, masquerading as a 'free generator / game hack'. The document body and extracted URLs reinforce this lure, aiming to trick users into visiting the malicious site. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

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/479516143/how-to-get-minecraft-for-free-on-pc-game-hack In PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-from-groups_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/tiktok-free-views-hack_GM835599320.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-case-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-roblox-2021-jailbreak_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-admins_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-client-for-money_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/add-free-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_off000030e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E3 22816 bytes
SHA-256: 113a8e873f701871eeff3e63d2de41108177104445e78c86cc410073f041af1c
font_01_sfnt_off000063f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 18316 bytes
SHA-256: 5655467c12bee0fa0248a8c5948e73232cacc99bd1e4914302b0032c669fa9f7

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