Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e626035b0a3df6…

MALICIOUS

PDF

48.1 KB Created: 2020-09-04 02:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ec2cd8022bfe0d8dfecb73a86ab8162 SHA-1: 20927b890cdb678569b0837a261e30f6c3db28aa SHA-256: 26e626035b0a3df67c6dd1f852f856054d844c673ba19dcd8a95d80822241d1d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier and contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also exhibits PDF_SEO_LINK_FARM behavior, embedding numerous links to other PDFs hosted on static.usrfiles.com. The primary malicious IOC is the redirector URL, which is likely used to distribute further payloads or lead users to malicious sites. The document body contains garbled text and what appears to be the same malicious URL and benign PDF links.

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/pify?keyword=2014+cadillac+cts+3.+6+performance+parts
    • https://static.usrfiles.com/ugd/834936_3be94a8054d44188b0c95b8e89e30ca1.pdf
    • https://static.usrfiles.com/ugd/07625c_ba05e45df84144f380f7d46d0a78a235.pdf
    • https://static.usrfiles.com/ugd/0c41e7_de45bbc246f942129a53711d880ab0c5.pdf
    • https://static.usrfiles.com/ugd/229b11_9be83f3d3a9d410bb712aacf0b0edf71.pdf
    • https://static.usrfiles.com/ugd/ca300b_2037376b998144778eeda4c5f6b4c133.pdf
    • https://static.usrfiles.com/ugd/accd1f_65e309964d4d4bc2830389e040b14dce.pdf
    • https://static.usrfiles.com/ugd/41a0b6_c7cf3afef5074785b20e7dfc419ccd97.pdf
    • https://static.usrfiles.com/ugd/b8c837_e32925c4c4944104ad021826a9565fad.pdf
    • https://static.usrfiles.com/ugd/6e13d9_3b488a299f544f39a82b23ac01de8c7c.pdf
    • https://static.usrfiles.com/ugd/fa6f14_3ca4e404727c47bfa719d189414e907b.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/21488284884.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/boardroom_marathi_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/72312403564.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/bihar_ssc_stenographer_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/gexubigobifatobomamelinod.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/angiotensina_aldosterona.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_off00007b5d.bin
a7ffed3182fe9a9d4af5b33798e64a8949b0ffa600d026372ceb4e997d993883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 5968 bytes
font_01_sfnt_off00008f9d.bin
abb973632e9418e0db9c85ce6c7895f582d798e53c85e2c1aa8a6753463a4787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9D 10696 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.