Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f12993b15c5b55…

MALICIOUS

PDF

32.6 KB Created: 2020-10-04 09:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 58c655c31a099420fdd9c2252b017362 SHA-1: 57742cc56896fc61959bf0fd28b94863e7353184 SHA-256: a1f12993b15c5b558efccec06ec9a1ebb2aba95955d05de58b7846283e534681
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure for a free PDF, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of multiple external PDF links, including one pointing to a known malicious redirector, indicates a likely attempt to lead the user to a compromised site or download further malware. No scripts were extracted, but the overall structure and link analysis strongly suggest a phishing or redirection attack.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cctraff.ru/strik?keyword=una+docena+al+dia+pdf+gratis In PDF document text
    • https://site-1037141.mozfiles.com/files/1037141/vujaxexuxotu.pdfIn PDF document text
    • http://jonevosa.k9workinglinegsdvonbennett.com/uploads/1/3/1/4/131410685/zagusenirozob_fiwalegejilef_ditomota.pdfIn PDF document text
    • http://files.goodpug.com/uploads/1/3/0/7/130775867/3054865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa654c2-20c4-4446-a7d0-dd080dad54be/wasiladaramodiketepipame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9f31b5-2f0d-4d35-abd1-ae9e22185d43/pitalevokazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4df6b8c-0c54-4975-8e79-98cc04493e6e/25165883797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267acd06-aaa4-4c98-85b1-9a9e261fc949/xarikujekuvijesexuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330726c3-412e-4990-8678-444a730d15e1/58231830408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10a70ed-ddac-4068-bb18-a481671c2f68/16659311285.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_off00003f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F29 5312 bytes
SHA-256: 06617c0ad0031b97bdddfb7b62ddc9c2eb68e99fbcea02dacd3852b972cd34c2
font_01_sfnt_off00005152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5152 10748 bytes
SHA-256: de7034552b8d71db21fcc56d676a0b43a52835f056408428d6b2fe3833098a7d

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