Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bd4c39b4e8f54c…

MALICIOUS

PDF

47.2 KB Created: 2021-06-11 06:31:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a0a1bbc20c0cd4aeef1b9690ca5418ee SHA-1: 753b19475c8cc2d228762e7cb95a89ab7af257f3 SHA-256: 73bd4c39b4e8f54c2e6c45988b9135f636be1c056ce87b58490537a57aab219c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising game hacks and free generators for popular games. The primary malicious link identified is https://netcdn.tw/app/431946152/roblox-cheat-android-1-game-hack, which is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to lure users to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-cheat-android-1-game-hack In PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/who-to-hack-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/roblox-account-being-hacked_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-place_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/robux-download_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_off0000543b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x543B 28852 bytes
SHA-256: afdf5d9305d28fa009914b485222674572f687c28a489a96361037ce7347237d
font_01_sfnt_off000094fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FC 18684 bytes
SHA-256: 5f8b2cf9432c59d7cc164e36b90924966c53a05f1111f1b7f043338ebb0e29ae

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