Malicious PDF — malware analysis report

Static analysis result for SHA-256 4594600ccb18daea…

MALICIOUS

PDF

53.2 KB Created: 2021-06-09 02:43:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 542d2f7b635577e35c0645c2964475bc SHA-1: e1e2b1174bae3e57fbcbff4aad32783da7d4638c SHA-256: 4594600ccb18daea1da672923b02ebcd2e16a892161b1c6fd09db90efc5e279d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game items and accounts to trick users into clicking malicious links. The document contains multiple embedded URLs that point to redirector infrastructure, ultimately leading to the URL https://netcdn.tw/app/431946152/free-roblox-2021-rich-accounts-logins-game-hack. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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.tw/app/431946152/free-roblox-2021-rich-accounts-logins-game-hack In PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/rbx-free_GM431946152.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sgsacall.sgsa.gov.mn/files/editor/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C5 27876 bytes
SHA-256: f7698f6f84e7c973a1109546ccb14e4f7515c8031239d37b66bd5e42752a400f
font_01_sfnt_off00009155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9155 3964 bytes
SHA-256: f6b9a386ee4e0aff622a98b2230905da71eab0ca98398cb52018fda3528d3e2a
font_02_sfnt_off00009eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB3 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_03_sfnt_off0000aaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA6 19168 bytes
SHA-256: e5213110e48bcc651c0539ac9e13b0a057ccb01ea4f3be172138093b3914be8c

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