Malicious PDF — malware analysis report

Static analysis result for SHA-256 859aab91d702fba6…

MALICIOUS

PDF

46.4 KB Created: 2021-05-20 04:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 554e6cd08d314101989912a487b81f28 SHA-1: 12b1f91a5cb78e5324866ccfa94d128241c88dca SHA-256: 859aab91d702fba670d5b128a701d9cc1bf59cba1486398c690922bccee510e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and sites offering game hacks and free currency, indicating a lure-based attack. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be directing users to potentially harmful external content, which could lead to further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/roebucks-on-roblox-game-hack In PDF document text
    • http://yochin.org.tw/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/hack-avatar_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://yochin.org.tw/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1C 26324 bytes
SHA-256: d9d3f6feb9530e5f8963a494eb251709db0024d5c8de0e13a25c80b682ab01f3
font_01_sfnt_off000089c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9371 18096 bytes
SHA-256: 660f2ad6d064874c4042e66c51e1deb22834a2626620b3d43ba9bd9331fe9e6c

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