Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a2ea786ee1205a…

MALICIOUS

PDF

51.4 KB Created: 2020-07-10 18:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcca760bf70357131b3afcea2b569023 SHA-1: 8fd10616b9db0d79232426cd928d3f540e2d4d36 SHA-256: 70a2ea786ee1205a9d9199cd3e8b1367a9bbdfdcbfb788b66a4c44e8b43b26f7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to domains associated with link farms and redirectors, indicating a malicious intent to direct users to harmful sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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=fundamentals%20of%20accounting%201%20pdf
    • http://files.riddlemusicstudio.com/uploads/1/3/0/7/130775001/1420371.pdf
    • http://files.starlight-angels-ministries.org/uploads/1/3/0/7/130774990/nojonimani.pdf
    • http://files.tinagutierrezartsphotography.com/uploads/1/3/0/7/130776123/lemagan.pdf
    • http://files.lifelonglearningpath.com/uploads/1/3/2/6/132681212/3c91b44480756.pdf
    • http://files.nphsjrwolfpack.com/uploads/1/3/1/4/131483253/pageponiputi_gosalobire_vopepas_fatibo.pdf
    • http://files.eastcountyrfc.org/uploads/1/3/0/7/130775737/1991001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xejolaxutibu.files.wordpress.com/2020/06/74663044587.pdf
    • https://wisetej.files.wordpress.com/2020/06/kikixemozolilojo.pdf
    • https://mabaxopol.files.wordpress.com/2020/07/birakuneze.pdf
    • https://jifumulunubi.files.wordpress.com/2020/06/dagezijijafixeki.pdf
    • https://rokonofivadi.files.wordpress.com/2020/06/88016398248.pdf
    • https://wevamuxugivi.files.wordpress.com/2020/06/62355089446.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/kipigixeduwir.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/70728465559.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/rivefamijaz.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_off00008c57.bin
56388c54c13eba7417ff5611304135f59145ede95badb835fd29bcc6e5e3c949
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C57 5268 bytes
font_01_sfnt_off00009e35.bin
2c41e23eb5e20fabea1aead466b8944c5d1b581d92704c82fd43d9e63fbdba4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E35 10208 bytes