Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dd5f855626cceb…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c6a2e4360495475b0fd8d1a7387d1b7 SHA-1: b6bb12e376972555edbbb2db4ac7d373479a3e8d SHA-256: 65dd5f855626cceb2eedd215c13bd1b9328a9eda96d41e5cd0fc8041359364ce
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 and embedded links suggest a lure related to a 'Gerber knife collectors price guide', likely intended to trick users into clicking the malicious URL. The PDF also contains a large number of external links, suggesting a link farm strategy.

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.cc/wix?keyword=gerber+knife+collectors+price+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_f68ba551c4664203a2ecacec1817c8da.pdf
    • https://static.usrfiles.com/ugd/cc03df_ea07de4e84c645618366ec56d120b35e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cbfb3842dee4ae882683dbbfaced294.pdf
    • https://static.usrfiles.com/ugd/be19e1_d4bdfe9ff82343dd89ddd764052d1121.pdf
    • https://static.usrfiles.com/ugd/b8c837_01138b9847b64762b35bb299ae6ebf02.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_8b3f06312a2f40a0bac30532d8aa833d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bec7f00dfa645c18488ffa75b96729d.pdf
    • https://static.usrfiles.com/ugd/253000_d04d68a1d80043f9881ff827451584b3.pdf
    • https://static.usrfiles.com/ugd/c7a620_879516d27886497d8a2cbeb68095fb5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_277c348a815a48619c48467ffd817073.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/bufipitabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9591/files/demolano.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/mawuwefumivijizabuke.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/japudonokobo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7099/4085/files/repukidogamuraw.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_off00006ee2.bin
e8401b2668b1f3d99b4fd334add6a5795214b0445124622fbedc5b0c7631457a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE2 5348 bytes
font_01_sfnt_off00008128.bin
87c73261683d01293fd63eafb09daae004566ecccc6a2db42281a65848728bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8128 10388 bytes