Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62de6cfb1e01d6f…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 18:10:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0a865f5d19ce07569327d8dd993e4b6a SHA-1: 5b2aa68656fec6b14be738425b36e5acffd39b92 SHA-256: f62de6cfb1e01d6f59ccc43c59b34ae6fa722223ebd82e022400cfbc2ed2f57d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-game-hack. This redirector is part of a lure for free game currency or hacks, indicating a phishing or scam attempt. The document body and embedded URLs reinforce this lure, suggesting the primary goal is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/how-to-get-free-robux-hack-game-hack In PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/pubg-10-000-uc-free_GM1330123889.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-roblox-t-sirde_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/my-roblox-account-has-been-hacked_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/tiktok-free-movies_GM835599320.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/se-puede-hackear-nighthawk-imperoum-roblox_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/tiktok-free-shares_GM835599320.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-jailbreak-hack-pc_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C2 22696 bytes
SHA-256: 4fd73dba1cd0660fd502593fef04e18761b1bb7e5d0ac7170818dd7e647af25f
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 19152 bytes
SHA-256: a9bff55de90b7722e0be476df1c7a65da1171d9638b3b21a902752e59eae7e63