Malicious PDF — malware analysis report

Static analysis result for SHA-256 40470dca998a2228…

MALICIOUS

PDF

48.3 KB Created: 2020-08-30 13:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc471d5984ab01c24dd64259f34de37c SHA-1: 2e80e0c637d50930168ce11585ada69442eb6166 SHA-256: 40470dca998a22282019f0fe8850ec7dae817cf1cb8d7c7e676f8116e17d34e9
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a significant portion pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the primary malicious URL. The heuristic firings confirm the presence of a malicious redirector link and a PDF link farm, indicating a social engineering attempt to lure users to malicious sites.

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=grim+dawn+wiki+deutsch
    • https://static.usrfiles.com/ugd/b8c837_54e8b102048c4dca9b8bdb9a244ef5ac.pdf
    • https://static.usrfiles.com/ugd/cac9e4_58eda45f4bc24b1b877d7f4bca76ce08.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7e58743c2014c5bae040b09d7186fc7.pdf
    • https://static.usrfiles.com/ugd/d01287_aacb25c6ecff4cdc962175f0b963f1ed.pdf
    • https://static.usrfiles.com/ugd/39cb9d_54d0f1f95d5a4e55a3093f28ffdb6ac3.pdf
    • https://static.usrfiles.com/ugd/b8c837_703ffef223da4f76a51eb4bc49d24e1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4d831feda404e4c92f81e710a87819e.pdf
    • https://static.usrfiles.com/ugd/d902bb_72202ea52848483db716c061ccd81ac2.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_84f2a3c93eae4d8e8a4c2ab07a664772.pdf
    • https://static.usrfiles.com/ugd/fd3290_0bb1c5529ea34e81a7ed6e702ae73415.pdf
    • https://static.usrfiles.com/ugd/b8c837_0430c70f4fc94b58b4a252bb469f3863.pdf
    • https://static.usrfiles.com/ugd/934fc3_a056eb143007467f8161e3eafbe9ef3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_175f96dd976f40d58580415c47c74b16.pdf
    • https://static.usrfiles.com/ugd/b8c837_80aecbb1ed024a25a680bbeac7b79734.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_off00007cb3.bin
6a595bf6590aff0f668a87f03fe7cc1862c3b627be525055617432713d8d41db
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 5332 bytes
font_01_sfnt_off00008eba.bin
aa916d6e7c9c69628621d9a0640b2bc6e281c470f4ef8737ec141af3c4efeafb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBA 11092 bytes