Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb107898de58785…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 15:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2959e9159389caa45493bdd55af9c991 SHA-1: 057bb7eb3f8b22904829cbb6b6f8b127f0fe6dcb SHA-256: dfb107898de5878558602b8715dfd9f2cb6f7c9ce1d8effd4c3460617ecadd9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, including a significant number on cdn.shopify.com. One of the primary links, however, directs to a known malicious redirector at 'ttraff.cc'. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=merton+s+modes+of+adaptation
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/kifuwonewudalaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/pebekozapiputanifozizazev.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/dojobetigisij.pdf
    • https://static.usrfiles.com/ugd/086daf_22c5df49bf0346fb9dd9e660cd3f9a5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68f497758a34a4bbeac80a33f96c643.pdf
    • https://static.usrfiles.com/ugd/b8c837_528317447e284e2898b0305cc4846d9f.pdf
    • https://static.usrfiles.com/ugd/824332_4529d0f142474d5cbf37b87f3993f3de.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/pefonugexizudos.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/48126880216.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/17769602286.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/39977475660.pdf
    • https://cdn.shopify.com/s/files/1/0462/6762/9730/files/62622849065.pdf
    • https://static.usrfiles.com/ugd/fd3290_8a19f0eed1324cc4b55cbfb7854612f7.pdf
    • https://static.usrfiles.com/ugd/eaf48f_51e91eb0de62423aa4af0e6ac28e5b22.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_7f8e39b7c90e45119c0388f0ddbb9b8f.pdf
    • https://static.usrfiles.com/ugd/003b86_a474f2b1775d4ddbaa25ab85ff13846d.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_off00006585.bin
4c8b9efdef56c5f16118997689433733525cadd810e2eec3ecb2d81d4fdfb610
pdf-font-stream PDF embedded font (sfnt) at offset 0x6585 5160 bytes
font_01_sfnt_off000076fc.bin
c1771541db561d1b2ba2cd0ea21a6503d21113e3489e5a719225d9f1854a9495
pdf-font-stream PDF embedded font (sfnt) at offset 0x76FC 9644 bytes