Malicious PDF — malware analysis report

Static analysis result for SHA-256 78537771ed6a50ca…

MALICIOUS

PDF

46.0 KB Created: 2020-09-01 05:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5511fb81443f5ff2d94f77ebc44904ca SHA-1: a59ff80640a8454b857a94a4be71e31942467c16 SHA-256: 78537771ed6a50ca0c8d8f76f8b6849777a114fc853c8927557d9126d4ce1abe
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm. The presence of many links suggests an attempt to obscure the malicious destination or engage in SEO manipulation for traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=analysis+test+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/83d902_8bf8a24441f44f68aee8cfc4c143f6c6.pdf
    • https://static.usrfiles.com/ugd/76156b_fd273a21d2ce429ba1361f77717ac623.pdf
    • https://static.usrfiles.com/ugd/8de238_fd098fa000da46fc8f87a8c9420c927f.pdf
    • https://static.usrfiles.com/ugd/60933b_da0b65b6bf214bf4bb46e13bfeb6fb99.pdf
    • https://static.usrfiles.com/ugd/b8c837_681f2cc7fc5c4ddc8bff164975e67588.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/35528973177.pdf
    • https://cdn.shopify.com/s/files/1/0434/4489/5909/files/lazosuraruvuvifa.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/synonyms_and_antonyms_grade_5.pdf
    • https://static.usrfiles.com/ugd/c8a981_d03865f8671240a1bd8de1fe9037af64.pdf
    • https://static.usrfiles.com/ugd/286fb8_3155e1b9c79e44e7b6d32cf997d5c2af.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/75951796940.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/ashok_leyland_dost_plus_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2965/files/debate_templates_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/iter_fusion_reactor.pdf
    • https://cdn.shopify.com/s/files/1/0460/2901/3151/files/pazipoguguxokanoporisuki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000690d.bin
4e275f1a4a96475f9b1afe99e5f6c065ab69daf769b49f520bf64b463e413dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690D 4692 bytes
font_01_sfnt_off00007904.bin
a93a3ce9e42ccdebfa457292a9664265a8ebcf6b25cb463674fe111fc331d72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 10572 bytes
font_02_sfnt_off00009d29.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D29 4324 bytes

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