Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ceafe343131d7e8…

MALICIOUS

PDF

34.4 KB Created: 2020-09-07 08:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65b9bbfd6ead455a2a3b36aa4563f2fc SHA-1: 18673fb191947874b2a28c5d7ad6bd78b8958227 SHA-256: 6ceafe343131d7e835f90f28ac031af22bf58d02d5fa8d85d42c5cd24a894347
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains the same text as the malicious URL's keyword parameter, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, many of which point to benign Shopify URLs, likely to disguise the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

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.link/wix?keyword=cool+ways+to+answer+what%2527+s+up
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/budutowek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/april_month_current_affairs_2020_bankers_adda.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/who_is_richest_nascar_driver.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_a4ffc1b638f3468480a74b72464b516e.pdf
    • https://static.usrfiles.com/ugd/ef7b09_e8a1f29a23fd44d480c3ca72a15a0228.pdf
    • https://static.usrfiles.com/ugd/ee6770_ca3c80ede6cd4682bc30379f25eafd7f.pdf
    • https://static.usrfiles.com/ugd/735424_712a37dbf6f94bdda633e50b5b8a2591.pdf
    • https://static.usrfiles.com/ugd/b47706_4b92822f5e7d4c2ba8cc20a403ab8427.pdf
    • https://static.usrfiles.com/ugd/de02f3_b1e85b939fce41ea83776ed2788ea86e.pdf
    • https://static.usrfiles.com/ugd/ec0012_b5980fb9b81a450993e730ab7c824393.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/94791623139.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/42351487893.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0426/files/kemuroz.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_off00004ac6.bin
f746729f2f83e002d5e7c8f1d68a145ec3891274e32cbc43203eb0475f464375
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC6 5040 bytes
font_01_sfnt_off00005bfc.bin
770dcf49d5092a95e699bd3a5ef223d3714ea51e56b353a45fb45225c7da4061
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFC 9668 bytes