Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d1a71a0377ad6a…

MALICIOUS

PDF

81.1 KB Created: 2020-08-29 13:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d540e8ef66b06edca3be803b1de23d SHA-1: 6d32127191dfdeb591fdc44e881fc53c52754784 SHA-256: 44d1a71a0377ad6a8a125fd88cd8b74055896af7cb37c1afef3e57acadad5b36
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, directing users to 'https://ttraff.cc/wix?keyword=wisner+gun+parts'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure for users interested in gun parts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=wisner+gun+parts
    • https://static.usrfiles.com/ugd/b8c837_559195fe310343769ccc0ecd72120be9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b49899ea6ce24531be5abbcbe765ce65.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebaebab9db8e494c85fdf9b5bd3c9800.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c2ee0dedd6a448a91324ba382142939.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/seradojorub.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/namoderoboxamenusuxodige.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/memoludiguxekalixupebis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/zesiw.pdf
    • https://static.usrfiles.com/ugd/b8c837_48ef981763f14e7cb887befc3eb6581d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6c190f4b6494997a8f83f845ef1045a.pdf
    • https://static.usrfiles.com/ugd/b8c837_32b3b959d5f145eb8ca0ef283448ae4f.pdf
    • https://static.usrfiles.com/ugd/a76634_09f78643dc07460f96ec81059a0ce042.pdf
    • https://static.usrfiles.com/ugd/b8c837_a643dda5e3f54544914d59487ff8ba11.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbd1a2af1ae94595991240fcbf6f8176.pdf
    • https://static.usrfiles.com/ugd/8cbfce_c758fd7b9bfc42ba9946000a9c5cf7b8.pdf
    • https://static.usrfiles.com/ugd/08fe48_4820f370b8324b0892fbbefcfccfd050.pdf
    • https://static.usrfiles.com/ugd/b8c837_0502482389fa47d68f232241c21bd58a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7567d631f994d1c92a30438b87d2f49.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e8.bin
db4cab5a0a86836822ca1e165f66f300f46761ee97cb1efb572a7d1d75b00d82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 4740 bytes
font_01_sfnt_off00010414.bin
3c3d8e1b4a50a65a9ef5bfc1fa3955f4891571cb394c3aa8696537f11a7c191d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 10808 bytes
font_02_sfnt_off0001290e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 4324 bytes