Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44fa9a1b127100…

MALICIOUS

PDF

38.9 KB Created: 2020-09-03 06:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 306887ca90383f0f3944cdd7053c74ae SHA-1: 411b0171f85c1680134ed902e4044ac3b5917752 SHA-256: 4b44fa9a1b127100de9618ec8efcfc3213cfff5109c3057ec954fe3fda2f08d6
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users through search engine optimization. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to malicious sites via deceptive links.

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.link/wix?keyword=lagu+boyce+avenue+perfect+acoustic
    • https://static.usrfiles.com/ugd/fbccce_2ce1f74792164c4fad57885b0e5e663d.pdf
    • https://static.usrfiles.com/ugd/b77b08_2ff4303fd39c40bdaee969b9b4c32e3a.pdf
    • https://static.usrfiles.com/ugd/d54300_e673f97a1dd14a6984d61cf0b7511b93.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fac8b22f7e44a8093401ab03043d3a5.pdf
    • https://static.usrfiles.com/ugd/23e9be_bd8d553dc3e44dadb3370aa0ddb56641.pdf
    • https://static.usrfiles.com/ugd/787b0a_2c7cb324a5d2433888b8f7112aeda9eb.pdf
    • https://static.usrfiles.com/ugd/73c254_6793f5d62f2a478b8f81e36ff21f8b9b.pdf
    • https://static.usrfiles.com/ugd/97493d_03b2a40605b34e20aa720930d14441dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8c2cb50eb44ad7bc8a04a14cb559bd.pdf
    • https://static.usrfiles.com/ugd/7dfe85_d26bd8123a7646988b3e48ad3991af66.pdf
    • https://static.usrfiles.com/ugd/c5d40f_1a8c854ddea14d0ca294bf13e666ffb1.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_74ade124b98c432982356039af935b94.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6c945ce8ca462986d5ccd3d3f84bf6.pdf
    • https://static.usrfiles.com/ugd/55e2c6_5f934258b4a146789079a59acaca5456.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_off00004289.bin
e73d0c666ce69862f7aaf347cadfcda9444810026af99a61c91680e184fcd9e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4289 5396 bytes
font_01_sfnt_off00005508.bin
638378a51fcb2adc0efda6a9b1ad8e80a5fe7190ac2c415da793427dbf76695b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5508 9112 bytes
font_02_sfnt_off00007449.bin
2c39e549adb2bfef32d75e1aefa5a7b22a08b80874b712758b231505bd2f9685
pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 17024 bytes