Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cc7343f7f175fe…

MALICIOUS

PDF

47.8 KB Created: 2020-09-01 07:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19bcafc2eddcb7b62532eb9cc300c15b SHA-1: 46c41268d51aeb331ab55e8f042685c3444f64c4 SHA-256: 55cc7343f7f175fec71944ea905ee96cddf6d8643063021c894e8a7e556349f9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a 'boomsday puzzle lab guide'. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to static.usrfiles.com. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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=boomsday+puzzle+lab+guide
    • https://static.usrfiles.com/ugd/b8c837_7c60409515f1431898c3ca459170e341.pdf
    • https://static.usrfiles.com/ugd/405339_87cef6a8156a46dc9c9e684188644234.pdf
    • https://static.usrfiles.com/ugd/b8c837_17c8f6c4e40b4f0fa3f29c9311347c6c.pdf
    • https://static.usrfiles.com/ugd/808d8c_085aab3713d249b78e940780b2936a21.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/98500511871.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/cladogram_analysis_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/93865791848.pdf
    • https://cdn.shopify.com/s/files/1/0463/2490/8193/files/17782671153.pdf
    • https://static.usrfiles.com/ugd/b8c837_65107c90225148b7ab58151f91e311ad.pdf
    • https://static.usrfiles.com/ugd/affaa6_d05ec5b93be44692adec6e3805b0a716.pdf
    • https://static.usrfiles.com/ugd/0b46e6_46a815c9874b4fabb759f8c4a8c2e020.pdf
    • https://static.usrfiles.com/ugd/e3834b_6262ac60c7e143e09088940fabb1e8a1.pdf
    • https://static.usrfiles.com/ugd/3b7182_d83dbfae089d4077a6b1236549700ff5.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6773/files/62787749984.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/supersu_2._82_zip.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_off00007bcf.bin
6a2ecda24c6a44f6091e7fef157778f8fdd813aacbc23e3a2163f0f090a83158
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCF 5524 bytes
font_01_sfnt_off00008e99.bin
60168a0003175c87df1f434f2c89a8668391a01f15ea8721af5d0cdeb3704d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E99 10472 bytes