Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dcaefc9c3813ad…

MALICIOUS

PDF

47.6 KB Created: 2020-08-21 11:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a502559d7762e2e4ba57e0419d8b2b07 SHA-1: 7997f3cf6f79abf69a444d2eb0a793c29827e02b SHA-256: 09dcaefc9c3813ad8b6cf09f76b16ea38c156b3b4b36c09a1190e48a3be2605f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=referee+report+aas+2019'. The document body, though partially corrupted, suggests a lure related to a 'referee report'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of many external PDF links suggests a link farm or redirection strategy to obscure the final malicious destination.

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.com/pify?keyword=referee+report+aas+2019
    • http://jojad.kimberly-andrews.com/uploads/1/3/0/7/130776659/zorusubog.pdf
    • http://files.msohomes.com/uploads/1/3/0/7/130776590/nisemow_tipudodum_kosisujij.pdf
    • http://jawejukon.fusw.org/uploads/1/3/2/3/132303189/91519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0676/2903/files/vuzizejulativuvomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/38655044927.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/69808297303.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/algebra_and_trigonometry_6th_edition_blitzer.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/voludugufezuzox.pdf
    • https://cdn.shopify.com/s/files/1/0460/2999/6191/files/tuvexatukajojov.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/waltz_in_a_minor_chopin_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/29167071487.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/49643210765.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/converting_length_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/82350270458.pdf
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/static_code_analysis_report_visual_studio.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b3.bin
0d7a892190d3523324d48f9ab87fd3ef080a40bcc3db5e8ecdc37c26e94e6e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5352 bytes
font_01_sfnt_off000077f2.bin
12eb272dce57158398400421827da227db6725cc183c5124f72cde12ff2cf8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F2 10512 bytes
font_02_sfnt_off00009bec.bin
069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEC 16376 bytes

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