Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3f3ebcb95489b3…

MALICIOUS

PDF

43.3 KB Created: 2020-09-01 06:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee7536aff0f833fa97a40aa3999a40d SHA-1: 72290addf2d6b3f223f9225938f6856bc8c96528 SHA-256: 5f3f3ebcb95489b3fcc206156f0d306a971f6263658f217d19694b1d8ab33759
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, masquerading as search results for a popular query, which ultimately lead to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the primary URL. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious verdict.

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=friday+night+smackdown+results+bleacher+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cf14a4_2ef6b34f74844f0f9f01b8489c9a3069.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe4d156699cb4103ae10e8fb5e5bc39a.pdf
    • https://static.usrfiles.com/ugd/2486b5_ac14e4525c364d5baffaea700df9e574.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/blackmagic_speed_test_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/51925201573.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/22188018531.pdf
    • https://cdn.shopify.com/s/files/1/0447/4427/8170/files/ayyubid_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/33359930839.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/47296438512.pdf
    • https://cdn.shopify.com/s/files/1/0438/5754/3328/files/22740400950.pdf
    • https://static.usrfiles.com/ugd/e02969_0f0a066b84504399975c5751074da97d.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_8cfcc6e0913546c9b49fece37d781dc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25029c95b1444699c610ca0f4363698.pdf
    • https://static.usrfiles.com/ugd/7598fa_826a381683e24ebc9c5fde853e70d280.pdf
    • https://static.usrfiles.com/ugd/b5472a_eb106a059f204440b3542bb6d951814e.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_off00006aa1.bin
9dc0b44cb701540d9b2389a787096f8d0369e9602eb44e1562f204230a07e85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 5840 bytes
font_01_sfnt_off00007e76.bin
83593c9b67d33d74577cd21610a279171d35bf93a5e939667a12e39735dea830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E76 9868 bytes

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