Malicious PDF — malware analysis report

Static analysis result for SHA-256 8128f1131786a05b…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 08:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49846559a4ec13825f680120c38fe639 SHA-1: 86ea5ccb7b63ac2a7df94f74f06160586ffc39a5 SHA-256: 8128f1131786a05b83228046b8c70150cc81cf4da6c82de73df196c331ce857c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which in turn leads to a large collection of other PDFs. This behavior is indicative of SEO poisoning or a link farm used to distribute malicious content or host phishing pages. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=infection+control+guidelines+kkm
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e745be_15724527f7354cd09a9b99d8686befa0.pdf
    • https://static.usrfiles.com/ugd/b8c837_022b0d37a9d44b1cbbf68fabf55a8b34.pdf
    • https://static.usrfiles.com/ugd/2e79a6_ed6e9000d93543b1872684f8040307cd.pdf
    • https://static.usrfiles.com/ugd/90423f_db2bb459bc3f4dc2b113a59e4da867cd.pdf
    • https://static.usrfiles.com/ugd/e4ff69_09729293e67049e499c72e028e4250a0.pdf
    • https://cdn.shopify.com/s/files/1/0441/0795/6376/files/83395888307.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/51516680100.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/characteristic_of_classroom_action_research.pdf
    • https://static.usrfiles.com/ugd/e33828_c248424e723c4cd1b696dfb7b7dcef9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c44688fb1614e98a61eb30f5d19554f.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/2007_chrysler_pacifica_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5749/files/63032184351.pdf
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/86033891631.pdf
    • https://cdn.shopify.com/s/files/1/0435/5964/9429/files/risazepisurabusixuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/5792246279.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a39.bin
ce416cb107eab04bcd4e49d0ed583db749711c49c6951a93314ec50a714d45ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A39 5132 bytes
font_01_sfnt_off00006b94.bin
ceb75952e761d2d76e5c21c3f88c7c74ed4fcf239b1f3daf7a834d1cb64858a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B94 14884 bytes