Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a017b33bfa77b8…

MALICIOUS

PDF

45.7 KB Created: 2020-09-04 18:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3732a104f492bc04832926824942db3a SHA-1: 7907eea2aaa184b8305de89c9ee170f4cdf404ca SHA-256: f4a017b33bfa77b8a68014aedea22031b4810b44ff9bf647fb2dae4dc9a71cf1
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to a domain associated with redirector infrastructure. The primary malicious URL identified is https://ttraff.me/wix?keyword=blomberg+dishwasher+dwt56502ss+manual, which is likely used to redirect users to further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malicious content.

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.me/wix?keyword=blomberg+dishwasher+dwt56502ss+manual
    • https://static.usrfiles.com/ugd/a18aa6_d15b0f9f53c8410599c7e096002a84ae.pdf
    • https://static.usrfiles.com/ugd/96bf9d_09c020ff340d474e8a79d5e57a55b143.pdf
    • https://static.usrfiles.com/ugd/3d7af5_3d57f628790c416e81131b28edef34db.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/39183407910.pdf
    • https://static.usrfiles.com/ugd/70c1f8_9926b2d2290d4e889cff3475f4f8112d.pdf
    • https://static.usrfiles.com/ugd/5cf23b_be416307efc84ad2a5621ff96377e03d.pdf
    • https://static.usrfiles.com/ugd/a42eed_5e3efd80bda744d99380f73ddbe269c4.pdf
    • https://static.usrfiles.com/ugd/d4579c_905653dab94941cea76976b9fa19f7af.pdf
    • https://static.usrfiles.com/ugd/866690_e53724dbc6264768a976e880a6036498.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_96d1f88054674e06965fa7788c8fb44d.pdf
    • https://static.usrfiles.com/ugd/0779a3_933f256d4b574215b6242a544593c99a.pdf
    • https://static.usrfiles.com/ugd/911c12_772a10dcdc9f48f0bb17cd3e49ef7d5d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006442.bin
a26e5203b7816f5f08ec58f357bce6f12b34b36a563e19d03bf4edab60067c04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 5952 bytes
font_01_sfnt_off00007876.bin
6b07a7bbb5a4e9025e24f85e52e9a18f786ceb91894948744b21a9711b7cb24a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7876 10368 bytes
font_02_sfnt_off00009c19.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C19 4324 bytes