Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b1427750bfe1b8…

MALICIOUS

PDF

39.5 KB Created: 2020-09-02 11:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2724d640ce88cb3bba58f20af65fd6e8 SHA-1: f765d1d716429a1e2faa2a1891be49ea004f5b65 SHA-256: 12b1427750bfe1b8f512c21b83028e94c93dfceba4fe5d4ede1323235b24c2ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDFs. One of these links, https://ttraff.com/wix?keyword=spring+framework+3.+0+5+jar, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to software development resources, likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded links and the ML classification strongly suggest malicious intent.

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.com/wix?keyword=spring+framework+3.+0+5+jar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/bodybuilding_anatomy_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/47639240727.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/64947456719.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/wawaripakugebepiviwo.pdf
    • https://static.usrfiles.com/ugd/83b1b3_07bac5a5597748599a5b709dc3bc153e.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8487d3ce10ea4ef9a77df16c80be9754.pdf
    • https://static.usrfiles.com/ugd/6a7407_565a817624234072a5ce0eebfe91d54a.pdf
    • https://static.usrfiles.com/ugd/7f929b_9d7523c0024d4e8f9067a4bcbd1e5494.pdf
    • https://static.usrfiles.com/ugd/7ff653_734fd0ecee534052b2e6f40553c0c570.pdf
    • https://static.usrfiles.com/ugd/88a84f_8b40fb7c4f55417aa6eeef1013988acb.pdf
    • https://static.usrfiles.com/ugd/7603ae_3529417b463245fb8fb4211cac25e6d4.pdf
    • https://static.usrfiles.com/ugd/e23fbb_99dbeb7bfddc494eba624e4ec0ff8ed2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005283.bin
727b9890a1957a6a37f6c3bbf0b19fc20953682a1ac222b6a9227fb059ef448b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5283 5808 bytes
font_01_sfnt_off00006660.bin
808160e9c898a60c2f8cc01516dd5d48365be8e2cbbc93f1fb9e1964c7f2d671
pdf-font-stream PDF embedded font (sfnt) at offset 0x6660 13576 bytes