Malicious PDF — malware analysis report

Static analysis result for SHA-256 df141bf6b79eaa5f…

MALICIOUS

PDF

35.9 KB Created: 2021-07-09 14:23:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2ba19243f1e70b40b7341bb313202c16 SHA-1: 48d46655271de35f260ec759e9bf49d422ac2c8e SHA-256: df141bf6b79eaa5f8aadc2bbf673de4aba24e50969aab8cf7473e649089d20c1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hack generators and related content. The primary URL, http://netcdn.tw/app/479516143/minecraft-xbox-360-free-game-hack, is identified as a malicious redirector. The document also functions as a link farm, directing users to a large number of PDFs hosted on failtesolar.com, likely as part of an SEO manipulation or further redirection scheme. No scripts were extracted, but the document's structure and embedded links strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/minecraft-xbox-360-free-game-hack In PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-become-a-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/roblox-hack-generator-secret-hack-revealedfree-robux_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/free-robux-for-kids-under-18_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-do-i-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/blonde-action-ponytail-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/dungeon-quest-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-make-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-fix-roblox-hacks-wikihow_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/descargar-roblox-hackeado-adopt-me-2021_GM431946152.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.failtesolar.com/uploaded_files/userfiles/files/mc-update_GM479516143.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_off00003399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3399 22896 bytes
SHA-256: eff76339a3366355517c1d4820333d535ecaf8a97b1a07a1cc1d13f650ee1f0b
font_01_sfnt_off00006701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 19108 bytes
SHA-256: 780e9e18689037371e4a8046ec7fe45e0606f213fc1aea5451374ef80604f4b5