Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc57db82d0ecfab…

MALICIOUS

PDF

41.9 KB Created: 2021-05-15 15:24:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 74279edc41000fd378eb34189f56c6d7 SHA-1: c80c08b88d47e5347698ea9f07dea3c519d0c0c1 SHA-256: 7dc57db82d0ecfabdc410e4088b69fd7a551d251770308c2f5d6818f048678d0
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 free currency sites. The primary redirector URL is identified as malicious infrastructure, and the document body itself contains a mix of obfuscated text and URLs pointing to a link farm. This suggests the document's purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-card-collection-hack-game-hack In PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/get-free-robux-com_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
stream_003_off00004bbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBE 24284 bytes
SHA-256: 8f6d67346c2056c87e47986507dc9eb55f42e08fb6da1daa12de4ebc8b96b887
font_01_sfnt_off00008232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8232 17964 bytes
SHA-256: d0052490f13f589f98fbd30f74aeacf3c49ad0bd20ea66898db4f5b5e3c0c321

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