Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a6e1bc63b5aed0…

MALICIOUS

PDF

43.4 KB Created: 2020-09-03 03:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9e7ff3506cedc46c59fc8beaa2457ec SHA-1: 62a6cc0af7d584fa6bc136b385525adeb4107e90 SHA-256: 64a6e1bc63b5aed0a0319be5d879a4315e54bb0d4ae5ab8ab43ffcf8675a1c34
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also flagged this PDF with high confidence.

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.me/pify?keyword=sql+developer+date+time+format+display In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/a467d2_5cb7c8651f6b41b792196c3edfddc3de.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b4a829_d7760a6af42b4a9f837cbd86b6aa9917.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ad2ade_6c4ab2e4858d43aeafcb8785b6c37c40.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/belgium_football_team_formation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8432/3741/files/13914434193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/rectangular_coordinate_system_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2443/9717/files/definicion_de_cariotipo_humano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/girudibuge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8951/6958/files/sukatigegirevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/jijosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/75088924466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/report_folders_icon.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_off000066b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B4 5576 bytes
SHA-256: e46b47ddd529cc212410735e8d9a0636aaf489a01139c1237e64863f5f6d84b0
font_01_sfnt_off000079a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 12224 bytes
SHA-256: 13026cf4b2154afdd4ad62956c4172da431ce350b011f10e3397486d9a8e954f

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