Malicious PDF — malware analysis report

Static analysis result for SHA-256 3620bc316a8b8116…

MALICIOUS

PDF

103.2 KB Created: 2020-08-30 01:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8100a6da88673dabdd4aa02644fa43 SHA-1: 9b199622d15c272215d944768348d5f3c24c5326 SHA-256: 3620bc316a8b8116e38ef3ea35f09d7ca674b388dfd71b6e88eae6c7b375de63
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains a URL that is also present in the heuristics. The primary attack pattern appears to be SEO link farming or redirection 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=ff+mobius+tier+list
    • https://static.usrfiles.com/ugd/80c1db_7f05dcf378e84724ae8fc37cc82dc9be.pdf
    • https://static.usrfiles.com/ugd/19103d_0cd2f78fcd614b529ef19ff4f2a312bb.pdf
    • https://static.usrfiles.com/ugd/fd7405_23587c2542ee4f4e9c856efe5911ea54.pdf
    • https://static.usrfiles.com/ugd/1a89c8_c56a393871c5475c8ab0c1cae152a70e.pdf
    • https://static.usrfiles.com/ugd/a76634_4f8db9c680824990a33ea41516a373cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_11734de3b77c411581461eb84533a23e.pdf
    • https://static.usrfiles.com/ugd/4b874d_8d17d4f0e3454967acdfc13850c0f65c.pdf
    • https://static.usrfiles.com/ugd/f4de5e_ee00ed8073104b2f9c61bff37966963a.pdf
    • https://static.usrfiles.com/ugd/d54300_de5fcc8442d24b449d3ca04e4b1c9882.pdf
    • https://static.usrfiles.com/ugd/b8c837_44c12939e27449dca1e76783b80fd58e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/6f7357_2d8034d8de4743ff8f42f76e79975b72.pdf
    • https://static.usrfiles.com/ugd/7ff653_e45e6575e33b4f2d9cd061651f3c66c7.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_off00013b68.bin
99e0de2d39af8d2dc569183cf2d2ca23f2b48d32a89ec14b29d0f0493f1fb07c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 4800 bytes
font_01_sfnt_off00014ba9.bin
01a433025717950cc44979f6f850a07a55f2f731c3d2cffa525fbfb00dff4cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA9 14736 bytes
font_02_sfnt_off00017a3f.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A3F 16092 bytes