Malicious PDF — malware analysis report

Static analysis result for SHA-256 107258ae03e1d2e4…

MALICIOUS

PDF

40.2 KB Created: 2020-08-23 18:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af884fc831ac9dd1ed9472ec734d3f83 SHA-1: e6a0eb6fc3c198ff25402515f4389d6757d51149 SHA-256: 107258ae03e1d2e407d349c1579b0f98c37952e7561fc3be72b37b54f00df23b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'useful lansweeper reports'. The presence of many external links, including a link farm, suggests an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or redirection attack.

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.ru/pify?keyword=useful+lansweeper+reports
    • http://files.bwfraser.com/uploads/1/3/2/6/132681771/1424516.pdf
    • http://files.writerstellall.com/uploads/1/3/0/7/130739593/8278294.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/kibewofuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/12408402831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/jibenobuxome.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/21_cfr_part_11_compliance_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/50666953743.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/bowuluwajefesod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/ruvijem.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/sapazojojinubakew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2181/files/reading_skills_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/42874094393.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_off00004bc4.bin
0e14e69a8830d7cf6a404e869d4741f2448e860709074a885f22ad845ac3c51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC4 4976 bytes
font_01_sfnt_off00005ccf.bin
bbc88f14205b87e57055c856f66ade17d67b4246f4d339160ab168f05b677acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCF 9956 bytes
font_02_sfnt_off00007f03.bin
f8e326b96df6c0457890c6346fd7f60b91beb129051a642dbd03fdf119a21fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F03 16116 bytes

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