Malicious PDF — malware analysis report

Static analysis result for SHA-256 34df254f5b57ab0f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 01:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce6354148f4ecc72a5b674a796556463 SHA-1: e265f060d46c8ba071bffabb67a7a12941ca77ba SHA-256: 34df254f5b57ab0fdba403a3a13a95acbc015de462be706b8bad17f5862fcbc7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file that contains numerous embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=the+essential+guide+to+overcoming+av'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on Shopify, suggesting a coordinated effort to drive traffic to malicious sites.

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=the+essential+guide+to+overcoming+av
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/jepemudogurakaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/wuvisotabul.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/35672524603.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/83018535131.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2931eb0f4b647fc8cead60f5e2cafda.pdf
    • https://static.usrfiles.com/ugd/b8c837_96d0b59aaa3745c1bd1cb70303ce10f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_99eb1d5955ec42d695d8d57107b57c72.pdf
    • https://static.usrfiles.com/ugd/b8c837_8856051bcabb420dbac5c28e3a1bca55.pdf
    • https://static.usrfiles.com/ugd/b8c837_5befc4d52e1247e49ff40fd82dcd01e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a96b52027037426995c4055e1696a306.pdf
    • https://static.usrfiles.com/ugd/b8c837_7caae7fb7eea4064ac077435fc87f62d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4441837d69a64498a0a3ca5df2a70ac5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34cfbf19d4b4a6b836b37eb174c7943.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e08d37e535c43a5b82f4c78f1e535e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_67c825450c344f868e092cdcf62d8aeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_718f5aa6ad314dbf956a23250d9ff214.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c93cdf559994137aac924232026cf28.pdf
    • https://static.usrfiles.com/ugd/b8c837_13f82009003746beacb116ca11566998.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d00.bin
ddf4db176138206bae02b1bb731819a3b6ec1dd6f2479dc6c3ccd960309b69f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 5364 bytes
font_01_sfnt_off00007f0e.bin
2c9154c7b179e09bf54dc99e4e07835142ddc6ecea81a902b95aa7a78d2d9d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 9936 bytes

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