Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c71ad80b0a30ff…

MALICIOUS

PDF

50.5 KB Created: 2020-08-30 05:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34a058f3f3c020784f17c9651e5ed9c SHA-1: 49907491d238d03e80644a9f5164f90bf356b5d3 SHA-256: 81c71ad80b0a30ff258e1ed2fb28e6fc40cee1246542c2bfd504248dcbfee279
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, https://ttraff.com/wix?keyword=ergo+proxy+download, which is likely intended to deliver malware or facilitate phishing. The document body and embedded links suggest a lure for downloading a proxy tool. The ML classifier strongly supports the malicious nature of this PDF.

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=ergo+proxy+download
    • https://static.usrfiles.com/ugd/b8c837_9b25b80b365d4e4b9469ac05a284220d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2611dc6242dd45be8fba7aff5a1e0f95.pdf
    • https://static.usrfiles.com/ugd/6d59ab_08a1502b42b048719eea856991ab4b5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef49ec6bf39c4bb486bb80f5e5d64998.pdf
    • https://static.usrfiles.com/ugd/f103bb_44b69baae0b74d80b5ac46eb5a9a3785.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/mivuwok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizazuvolabemonixodokij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/woxumopekafipupubel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/89509896290.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/42173468237.pdf
    • https://cdn.shopify.com/s/files/1/0433/9679/2471/files/lejazimizevapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/warewipeve.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed9.bin
db52ea69e46305018dea5cab2115ed065dd329e6a03843e6a5db2bffe1172cbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED9 6464 bytes
font_01_sfnt_off00006ed7.bin
8535ca2bfd6ac25da30a811a4a594531d5583c8a14991e13009c5b4c3e2a52cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 4712 bytes
font_02_sfnt_off00007eed.bin
f3718b5717fe9c26193ccf23e2c4a487d648d57cb63b1ec9e59aaf9c024ecac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EED 15988 bytes
font_03_sfnt_off0000aef8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 4324 bytes