Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04ed73efb4307c7…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 16:46:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e738cacae12ce5f693121acae2d38163 SHA-1: 97673d074d91b9d47118e6bc3e126ebbd1dae523 SHA-256: a04ed73efb4307c7c5e268cedbef6ff537d62f753d9fedd74a442bfb0ddb32c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or 'game hacks'. The primary link, https://netcdn.tw/app/431946152/free-robux-only-today-ad-game-hack, is flagged as malicious and part of a redirector infrastructure. The document body, though partially garbled, contains references to these lures and the authoring application, wkhtmltopdf. No scripts were extracted, but the presence of malicious links and the lure strongly suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-robux-only-today-ad-game-hack In PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-dungeon-quest-no-skill-coulddown-script-hack_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-have-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/robux-codes_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-xbox-gameachivements-roblox_GM431946152.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-do-u-get-free-robux_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_off0000508b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x508B 25224 bytes
SHA-256: adaf2f1b574a35d1f7414e1eaee9227d3fe4f37c4bcba1f881db763f2a099d69
font_01_sfnt_off00008af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF3 18668 bytes
SHA-256: e7ce6860bcd10981a1892ee3a8d05780e2de51375369acedfb5d924fc5db4216

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