Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b5b25b2a65013c…

MALICIOUS

PDF

34.7 KB Created: 2020-08-29 13:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d6d87f0cb5416b05222ada50ed39d04 SHA-1: ee713ece6fc224c4dea4edb95d71568054e545f6 SHA-256: 71b5b25b2a65013c2224ae1e5d58caf486e3865d607575907ea8cb7a297077bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of external links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is ttraff.cc, which is flagged as malicious. The document body, though heavily obfuscated, contains references to the book 'Oceanography garrison 7th edition' and the malicious URL, suggesting a lure to trick users into clicking the 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.cc/wix?keyword=oceanography+garrison+7th+edition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_cab7553f7f8c4a008b4a5201ebc96a32.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ea82feab48846e2affe08e1fd49485a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d24675b4c5149198d1408813808f92c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f62f246936b840a3b8e8fc34dba5e987.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6f2e82f2056476c8f128984f862d88f.pdf
    • https://static.usrfiles.com/ugd/b8c837_24d129917d90431a908a9446f5890dce.pdf
    • https://cdn.shopify.com/s/files/1/0437/4704/9621/files/antecedentes_historicos_de_la_contabilidad_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/putinakewulujisuxomifodom.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/buxudojuvilopededobi.pdf
    • https://static.usrfiles.com/ugd/b8c837_95934258a53e480794f555e204c034ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb7fc2dae14e4569b8b42b5c837cbf2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8c1b7c2300c4639b99ccf2f4fdb7625.pdf
    • https://static.usrfiles.com/ugd/b8c837_c11c106f5308404e8bcecb6ab144af0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a66b4b91c04d7ca7bc5b379402bddd.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_off0000477f.bin
cca1bcaae60622a711f573dcf0f5890a6a6c7e8cec11d9f8e078214df7f9d853
pdf-font-stream PDF embedded font (sfnt) at offset 0x477F 5512 bytes
font_01_sfnt_off00005a39.bin
2c173adbc82412f3802714a001d5cef911aac4d76dd99112cb83537352011255
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A39 10856 bytes