Malicious PDF — malware analysis report

Static analysis result for SHA-256 4211c914e5093271…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 20:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a00289f38b085f6ba87f73316cf816 SHA-1: 2be5affae426728496a11cee8872c1449296480e SHA-256: 4211c914e5093271de9776d0538e3081a1e9ee35c2b06bf626096f753db2cf91
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=proteus+arduino+simulator'. This URL is presented within the document body, likely as a lure for users to click and be redirected to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector is sufficient to classify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/wix?keyword=proteus+arduino+simulator
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/66515512602.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/tivetotinekakakumipadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/chronomancer_5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4313/files/33477634965.pdf
    • https://cdn.shopify.com/s/files/1/0438/5370/9472/files/unity_dissolve_shader.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/pdf_to_word_converter_free_download_software_for_windows_7.pdf
    • https://static.usrfiles.com/ugd/93971e_c3dc3ab5dee34415878c32578579efc5.pdf
    • https://static.usrfiles.com/ugd/f0e51d_f69be86890224a55a5adcd27c6744e3d.pdf
    • https://static.usrfiles.com/ugd/b52961_2e9f755dfeda4f4a82122865fcfec6ef.pdf
    • https://static.usrfiles.com/ugd/08fe48_e98d08552b314b6dae34b924748ef267.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d1e35c3c613448882a11ca4a22253f1.pdf
    • https://cdn.shopify.com/s/files/1/0445/6172/7647/files/club_penguin_membership_codes_2016.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/46688967594.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005df9.bin
e338dd4398bc37fefb7ef530c0258035853ccc05c9dcdcc8495ba6d357db8bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF9 4972 bytes
font_01_sfnt_off00006ec8.bin
ad3f9444505a72aaa5a5384f7afc82ba86be5713094d34276d9135b507d56f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC8 14760 bytes