Malicious PDF — malware analysis report

Static analysis result for SHA-256 85336b1e6a4e2e95…

MALICIOUS

PDF

31.8 KB Created: 2020-07-07 12:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0157fd254a33fab7535982a45375b8 SHA-1: 77dc64c34ea097240da7867c559fecfdb0593235 SHA-256: 85336b1e6a4e2e952d0953c3e377013ec990e794d744488eb869cf93bdf19832
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms designed for SEO manipulation. One prominent URL, 'https://ttraff.com/wb?keyword=electron%20configuration%20pdf%20download#electron+configuration+pdf+download', is identified as a malicious redirector. The document body also contains numerous links to external PDF files, suggesting a lure to download further malicious content or visit compromised sites. The ML classifier strongly indicated maliciousness.

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/wb?keyword=electron%20configuration%20pdf%20download#electron+configuration+pdf+download
    • http://files.loveandmercyfdc.com/uploads/1/3/1/8/131857071/tazowirujuvimi.pdf
    • http://files.rebeccalynnphotography.net/uploads/1/3/0/8/130874518/4840188.pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://files.risingravenband.com/uploads/1/3/1/3/131384018/buvab.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://files.pst4y.org/uploads/1/3/0/7/130738814/piwagitasesesuwatug.pdf
    • http://files.exmouthcaninecentre.co.uk/uploads/1/3/0/8/130874128/jenasaj.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdf
    • https://nudademexu.files.wordpress.com/2020/06/kadabepalopilubowasi.pdf
    • https://gosebiweka941800450.files.wordpress.com/2020/06/xopuxitivujiluxo.pdf
    • https://nomakegune.files.wordpress.com/2020/06/77595843194.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_off000042ed.bin
75344d8eb5f42bc8c618bbd47965ced0c2026ba8c935ef7a7613a3caabb4720d
pdf-font-stream PDF embedded font (sfnt) at offset 0x42ED 5076 bytes
font_01_sfnt_off0000544e.bin
9eabba3a6f0fccaa3b24220fd26cb9f19bd318e7a30cd52b98286faba4149830
pdf-font-stream PDF embedded font (sfnt) at offset 0x544E 9008 bytes