Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3844a249948277…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 512d16a1e9943fd99184c213cadf1db0 SHA-1: 341bbb4e55fe66d2046cc4e45d10ea20d7485ec8 SHA-256: 7f3844a249948277f81cf454ce9c099c522958f74ef5820444f65291274add1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple PDF documents, with one link identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially harmful content through a deceptive link structure.

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=indirdik.+2.+tr+gg
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/promenades_2nd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/invalid_active_developer_path_library_developer_commandlinetools.pdf
    • https://static.usrfiles.com/ugd/b8c837_b009da7b176544e0ae42b3d0e333aa29.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/kixukegiwazafub.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/pibasedazonitiluri.pdf
    • https://cdn.shopify.com/s/files/1/0433/1402/0505/files/autocad_2015_crack_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/critical_role_campaign_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/fomikojepavitusuw.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed8f9bdbfa0e447d8cbe318a72c2cbf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8c2e267e4b74361af773f31ab0b98db.pdf
    • https://static.usrfiles.com/ugd/067ecb_cab2c1827b4749c6942218a0fb29cc71.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f3b9c2cb1cd470db88665cd18bc7821.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_off000068bd.bin
b05ced45f23defb7f66268c01775a3b5dd7e95c153c6dd4f57cc86ea3af8e89d
pdf-font-stream PDF embedded font (sfnt) at offset 0x68BD 4740 bytes
font_01_sfnt_off000078ed.bin
7c7148df4b419affaf29f97aecc85052bc6d9ea141f6d354ba2b540bb331dbc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x78ED 11736 bytes