Malicious PDF — malware analysis report

Static analysis result for SHA-256 113239dea99e0c2f…

MALICIOUS

PDF

37.6 KB Created: 2021-07-05 14:25:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 37701d9c03e3d01c094d4fb2326a4f22 SHA-1: d629af2411cf9b1ee96977fc9d68f50566c62be3 SHA-256: 113239dea99e0c2f212a8c8b73796e2604da0d90ada3b306dab0465d0f67577c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with themes like 'free generator' and 'game hack'. The primary malicious URL identified is http://netcdn.tw/app/406889139/reddit-coin-master-hack-game-hack, which is likely used to deliver a second-stage payload or redirect to a phishing site. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to trick users into visiting harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/reddit-coin-master-hack-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/simple-roblox-hack-hp_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/april-2021-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/tiktok-free-folowers-online_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-key_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/camecards-for-roblox-robux-free-sent-to-email-no-surveys_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/survival-games-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-2-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-server-roblox-script_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-jojo-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-free-robux-pastebin_GM431946152.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
stream_002_off000031ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EE 23200 bytes
SHA-256: 3046c717e7120f9700c975b83c40927b9ef0527fdb7aeb4763527841d5b6161b
font_01_sfnt_off0000667a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off0000705f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x705F 18180 bytes
SHA-256: 7b7b830d622982d8919e89c01570c642ed90793247a4b88b856bfd7aac266e76

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