Malicious PDF — malware analysis report

Static analysis result for SHA-256 137411e028a8e59b…

MALICIOUS

PDF

45.3 KB Created: 2020-11-01 12:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 32cbfd63d5bdf0a62b232ec5b49f76db SHA-1: 3dfc0d753ee96afc2c05a71c9a41515c1aa7acb7 SHA-256: 137411e028a8e59bf67b7a262a3b4d070c819df98708343ccee4747f25a17d6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a specific redirector URL, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains the same text as the malicious URL, suggesting a lure to trick users into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?keyword=agency+by+ratification+definition In PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/xusozav-lovalinisakix-javabife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_5f90703996e20.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/39231b46-ddef-4842-ba27-ff2f0137abc5/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6990/6337/files/sixivetuti.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/agreement_format_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da83b430-81ca-49de-bb94-97dd4a46aa95/83426160578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d09788-1741-4bbb-b196-4f3bcaabdb44/3208470359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545a85c1-3ca1-425b-b5cd-3eaed0a32148/26457085883.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_off000071c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 5212 bytes
SHA-256: f2926ca74631e477ed8f024eacc4ab8414754f806afe61ef7d98813e15ec02f8
font_01_sfnt_off00008399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8399 10840 bytes
SHA-256: 9feeda7a7d1703fe75efb96ce04315514304b10d1c8ccf8f708ae6b37b9b1515