Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b178c171f93581a…

MALICIOUS

PDF

50.7 KB Created: 2020-08-29 01:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07ac65b098fb5b9afdb63b62f4510ab7 SHA-1: f1f7d125aa48f5428166e892dd9515ff375f1a41 SHA-256: 8b178c171f93581a474e368c2f5124ba354963c5135674091ec6e75c7d193721
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through numerous seemingly benign links. No scripts were extracted from this sample.

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=lifespan+development+a+topical+appro
    • https://static.usrfiles.com/ugd/b8c837_0f2dbd3b8701473b8612224cda78fa8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cc9a21817e24df2867177d881349732.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcd8e38937a246e79aa2b37feac3b5cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://static.usrfiles.com/ugd/b8c837_95984a5f735046ce9fcdf2916bf839b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f73c7d0a84141f9b3453a32242d03eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c8334de11cb427abfe117f3087708ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e96a6c8c9e04edd9ce6e73a0fb29306.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b9e23b4b9934d2db19b0d21ea6496d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f8faf09562a4f0f85a6dca7b8124fce.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce34b69915f945f9996a0bdff8cedec7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28ad10048174f96ad44a077dbc55c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_04d9a5dc6c114c009b489c546dfeb623.pdf
    • https://static.usrfiles.com/ugd/b8c837_8892ecd23144482e8596fe79f68ec74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_42a66ad919d34360ae6ce3c67c1ee1a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa7970f8d3f5486ba68204eadbf8bc0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7018903051f044beb3f1af54db9e7b8c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000878d.bin
78c37919503caa315c25c62511b7be2bfe852a5b2e301ccb715100192282b7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x878D 5304 bytes
font_01_sfnt_off0000998a.bin
26070cc23fb0f79a2664dd8e09fbb6f28f86278e5c1cdba7144e19e816283162
pdf-font-stream PDF embedded font (sfnt) at offset 0x998A 10712 bytes