Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddc2ea441be6462…

MALICIOUS

PDF

34.6 KB Created: 2020-08-29 13:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de080dd49e01d4cb58baa398d021c760 SHA-1: c5644f581fc5062da5505e248244231e0b88ae62 SHA-256: 1ddc2ea441be6462e8dbdd8403ba83714cfb69c250ae53ed8397d6ac830ecd9c
152 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous links to other PDF documents. One of these links, 'https://ttraff.ru/wix?keyword=mesa+de+cirugia+veterinaria', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it may be part of a larger malicious operation.

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.ru/wix?keyword=mesa+de+cirugia+veterinaria
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70686619693.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/22485381343.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/delududilubupet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8817/4497/files/97109630904.pdf
    • https://cdn.shopify.com/s/files/1/0428/8954/3836/files/subjonctif_ccdmd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6c73a0db134c0095ad4887dd126290.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9df525fec94099a8c97dcaba23c6f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d79861854824991adbe7d2eadd95e92.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.pdf
    • https://static.usrfiles.com/ugd/b8c837_923bbfc14b07433fbd2d5976e3bd228b.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/94378085279.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/37171196570.pdf
    • https://static.usrfiles.com/ugd/b8c837_311ac8a35f724e76879e5d5b94320154.pdf
    • https://static.usrfiles.com/ugd/067ecb_3d5f11d5ad474090b6ee9f4da98c8645.pdf
    • https://static.usrfiles.com/ugd/b8c837_029771cc94794afeb1f2d724146955ac.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_off000047fc.bin
b55c3c3b4d5eacfcf2ce2a1b0802535000eaa5c7bf278a9375def5c3876a3c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x47FC 5140 bytes
font_01_sfnt_off0000598c.bin
a13e2300e02d92c979dd80b285c9b6e0e2fd46508d9f755fac5af9cdda371122
pdf-font-stream PDF embedded font (sfnt) at offset 0x598C 11136 bytes