Malicious PDF — malware analysis report

Static analysis result for SHA-256 426afdef9ed2ee1c…

MALICIOUS

PDF

48.0 KB Created: 2020-09-01 04:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 242c1091ad817a933c88a403b4697d56 SHA-1: d3d7afada0ff78868254078f5581eaf9d765496d SHA-256: 426afdef9ed2ee1cd319e08392f6c53c26c083472d6ac573aee98c9c7970afc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a malicious URL, masquerading as information about jail inmates. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the lure text and the malicious URL.

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.me/wix?keyword=bartow+county+jail+inmate+information
    • https://static.usrfiles.com/ugd/136d07_8fda55c366e5416baf0fb08b6dcac448.pdf
    • https://static.usrfiles.com/ugd/1cfe37_c02cf4a72724490cbf0d21effe37b347.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d24299663f74cb9828fc4d8b1de3ae4.pdf
    • https://static.usrfiles.com/ugd/850f07_4d7fea83f8f94d4e83944197af486446.pdf
    • https://static.usrfiles.com/ugd/b5472a_fc343a07ff494b45a1eb3a5fe7329122.pdf
    • https://static.usrfiles.com/ugd/b8c837_aed81ba7b08a47d29e8023889db43d12.pdf
    • https://static.usrfiles.com/ugd/c8a981_bfff3d99f0074cfa8c4eaca5a97a6eca.pdf
    • https://static.usrfiles.com/ugd/f3cb45_9b8f9bf1fb0b4c84923aacd50fde78f3.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_dd8fd07a839c4ed88a53e6c7ef55eb18.pdf
    • https://static.usrfiles.com/ugd/b88e3d_b7402e7c3a9749f5b0b97ba34280f8b8.pdf
    • https://static.usrfiles.com/ugd/f65518_1e0147b4b65d4975bd15b19036439e7d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/rutherford_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81143567733.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/vexewig.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/bijunobaduzuton.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_off00006ee8.bin
b0df8c037e114f35c100b30182b0a1b48e524cbb36c1ad1c53f9a51a14bf64d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE8 5052 bytes
font_01_sfnt_off00008016.bin
251b66818d7490f9dd4b272b2ec7e617c8cb55c58ee1596c5105461077573131
pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 10812 bytes
font_02_sfnt_off0000a510.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xA510 4324 bytes