Malicious PDF — malware analysis report

Static analysis result for SHA-256 622ef64e7ce7e9bd…

MALICIOUS

PDF

59.8 KB Created: 2020-08-31 05:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815c84ffdf503cb6145004ba640bcfc9 SHA-1: 56b6c264e6f8fbc9509c474b05e5b64185b2583c SHA-256: 622ef64e7ce7e9bd1547b9908c7cce2dfc6e17c3d8b9df69e36d48c144f4f39f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'ttraff.com'. Additionally, it exhibits PDF_SEO_LINK_FARM behavior with numerous external links, including one to 'static.usrfiles.com'. The ML classifier also flagged this PDF as malicious. These indicators suggest the document is designed to redirect users to malicious infrastructure, potentially as part of a phishing or content-farming scheme.

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=prentice%2527+s+rule
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_79014978337143ef8aa256f3ebac420b.pdf
    • https://static.usrfiles.com/ugd/0779a3_3244f478f6344f009ca30a71d1e82e57.pdf
    • https://static.usrfiles.com/ugd/1df9ea_656d951d828246a1b0e1cdbeca419cc4.pdf
    • https://static.usrfiles.com/ugd/455f95_1437a63ea5d44432945b8b37a9b527d5.pdf
    • https://cdn.shopify.com/s/files/1/0454/3755/0742/files/alight_motion_pro_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/jasodabamolisir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9024/files/fekiwexexodogofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/38268208260.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_eb89bd9d9f8d49828d7a3bede8722e96.pdf
    • https://static.usrfiles.com/ugd/c3f59f_6fbbb5b849d745ee99e452f4167c009d.pdf
    • https://static.usrfiles.com/ugd/5ecadc_16d0c184e30c461da5e34c11366dbd58.pdf
    • https://static.usrfiles.com/ugd/7c30af_83256be57b774eb5a44495042014f593.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ae2.bin
a064cfdedc44631b9ce79dbdee8c9262bba052e053c510fd0fb41de40f3b3e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE2 4616 bytes
font_01_sfnt_off0000aaa1.bin
fa55f5e1e820ff37f3b4de074692440c233f47a7b1ae6c10c6761348d1b9a185
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA1 10120 bytes
font_02_sfnt_off0000cd76.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 16036 bytes