Malicious PDF — malware analysis report

Static analysis result for SHA-256 03779b74d8be8dbf…

MALICIOUS

PDF

40.5 KB Created: 2020-11-07 21:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3f3ae6bc56dc388b393f432cf4ef3729 SHA-1: 0e4bc4e0049f6d3a76226fb7a22d02709f138ff7 SHA-256: 03779b74d8be8dbf66822b2623eb6a64b0a8e7080f4409657ca45a1ba46dc9a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link that redirects to a malicious domain, likely as part of a phishing or scam campaign. The document body, though heavily obfuscated, contains text related to 'SAT practice test' and the malicious URL, suggesting a lure to trick users into clicking. The ML classifier also strongly indicated 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://traffking.ru/aws?keyword=sat+practice+test+4+college+board+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fa4276664ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f9098f9e2b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f8bb8f626b63.pdfIn PDF document text
    • https://tofojuduvebexaj.weebly.com/uploads/1/3/4/6/134650498/zajafig-laxigel-tegatamizifam-sofama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fa61950d3a8c.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/fajine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f897510a16da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mikosefuz492460143.files.wordpress.com/2020/11/70777988362.pdfIn PDF document text
    • https://woxawekobati.files.wordpress.com/2020/11/aptransco_ae_notification_2020.pdfIn PDF document text
    • https://vofalop.files.wordpress.com/2020/11/the_famished_road_theme.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF5 5664 bytes
SHA-256: df683084cffe37bdb1f33394fc60d49cc10b261e1db71126e1fc0d5c903086fa
font_01_sfnt_off00007259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7259 10144 bytes
SHA-256: 54146a81b89c10f2d38404f81fa108c62a6b1da2109603817dce8994b8a4a642

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