Malicious PDF — malware analysis report

Static analysis result for SHA-256 06738a90809ab837…

MALICIOUS

PDF

30.6 KB Created: 2020-08-15 09:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97de4278e4087dfe15d92b7a16540dad SHA-1: 7f8dc1ee5068b0b30041547ffb3c87e2b149ac50 SHA-256: 06738a90809ab837f261717eb2d1380bf9163e043f81dbeefbb236a911de0ace
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text that appears to be a title and references the redirector URL, suggesting a lure to trick users into visiting malicious sites. The ML classifier also 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.cc/wb?keyword=pcnc%201100%20manual
    • http://files.seelenleben.ch/uploads/1/3/1/3/131380951/19288ada1bc346f.pdf
    • http://bafupukav.tritonchicago.com/uploads/1/3/1/4/131438003/zatenatavimeluja.pdf
    • http://zolun.suzypal.com/uploads/1/3/1/6/131606183/a077457dc9f4c9.pdf
    • http://files.directdoctors.org/uploads/1/3/1/0/131070336/125763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3434/5625/files/alopurinol_posologia.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/vernon_ct_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/bitsat_exam_paper.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/divujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/equidad_de_genero_ensayo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/comptia_cysa.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/approach_to_syncope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/98910383816.pdf
    • https://cdn.shopify.com/s/files/1/0433/5111/3887/files/laruv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7256/files/12347732854.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ede.bin
d5a7fd04dbbf464630fc2a5cb569498b7d553ab2f6a955de5c16ab9c63295f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x3EDE 4868 bytes
font_01_sfnt_off00004f58.bin
960aa6ba43a29c44046efe7df3a03065ebe39e9e5a394ec9423c8a3b60ca15a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F58 9004 bytes