Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a807c8c5517a59…

MALICIOUS

PDF

59.3 KB Created: 2020-08-30 19:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0526fa2366dd8590002b413ebc5ef3b SHA-1: 68e5bd0ef2310369b376dab1fb6d56b5bf08d214 SHA-256: f4a807c8c5517a59d655aebefbdded04833e745639c03835c79f938c7a38ed7e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link disguised as a software download for 'Adobe cs5. 5 master collection seria'. This link, https://ttraff.cc/wix?keyword=adobe+cs5.+5+master+collection+seria, is flagged as a malicious redirector. The PDF also contains a large number of external links, many pointing to Shopify, which is characteristic of SEO link farm tactics to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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=adobe+cs5.+5+master+collection+seria
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/the_interlopers_summary.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/95470132979.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/todiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1862/3896/files/57270249476.pdf
    • https://cdn.shopify.com/s/files/1/0434/1432/3356/files/6608549970.pdf
    • https://static.usrfiles.com/ugd/906e9f_69a4173ffa9a486a84c6311fed6d36fc.pdf
    • https://static.usrfiles.com/ugd/a1fb72_7882d0f8703b49a194b7878b0652cd50.pdf
    • https://static.usrfiles.com/ugd/3649d2_9057ecd086634131855e92ac2c227bba.pdf
    • https://static.usrfiles.com/ugd/83e24f_5af7e53ea9cb402e8389aea0c7e96353.pdf
    • https://static.usrfiles.com/ugd/dd4472_38469537bd66484eaad38d4ff177c1a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f270386712642d7ab246af03b1606e4.pdf
    • https://static.usrfiles.com/ugd/34e21e_30de61bf79174fbcb2962452b821bddb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c9ac6d87a2b44e1a8b8648094a9387c.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_off0000a2d1.bin
5ed953ec0757991433def8c6be5705e181a1839c83a073f78075a799d0f3b5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D1 5372 bytes
font_01_sfnt_off0000b4fc.bin
b579fdd20ad12782fc925e61bc78a42320f6811128ba5a2b1ff3b6c4dc7d411a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 13340 bytes