Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0141a09ef2736b…

MALICIOUS

PDF

37.9 KB Created: 2020-08-16 11:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 820ba3181a2a4db7735c6131e625b7b1 SHA-1: b610b041342fa4c9639c43ccdcc21b7907c8a940 SHA-256: 6e0141a09ef2736b53fdbb7a80b6f4686302a3e08ca29c5b8cfddb171284c847
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'geography quiz worksheet'. The presence of many external PDF links, some pointing to potentially malicious domains, indicates an attempt to distribute further content or redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/pify?keyword=geography+quiz+worksheet
    • http://buwofux.wrobertconnor.com/uploads/1/3/1/6/131636665/57ff353bf.pdf
    • http://files.aestheticon.com.au/uploads/1/3/1/4/131453574/e7d6c2.pdf
    • http://files.victoriazamora.net/uploads/1/3/0/8/130874252/tasofopapofa.pdf
    • http://lamam.fulloflife.ca/uploads/1/3/1/4/131437850/7cc324c57e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/zexewibox.pdf
    • https://cdn.shopify.com/s/files/1/0435/9595/6386/files/89621603856.pdf
    • https://cdn.shopify.com/s/files/1/0440/8157/8136/files/54975710181.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/simon_ielts_writing_task_1_general.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/sopuve.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/nojunez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/dovipuborikorawowirafekat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/buxukeruluriwikezija.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3420/files/book_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/4573/8903/files/mod_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/kaluvikigafod.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_off000053bd.bin
1eba3e41413dcd1d70df03b5b07d17e850ca16c797e6d89e95317325bbb9c169
pdf-font-stream PDF embedded font (sfnt) at offset 0x53BD 5512 bytes
font_01_sfnt_off000066a2.bin
182148a993e325177d0e38f52270bbac7d992297e05e0e996812e87b9eb8595a
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A2 10716 bytes