Malicious PDF — malware analysis report

Static analysis result for SHA-256 15097e55d9a13d23…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 09:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a03da08920e02db8e62b6f298038328 SHA-1: b5df18ceb05386894ae5440f543086ca54b0d608 SHA-256: 15097e55d9a13d231e74287f4019a6040a575bc62ffa96f01991e08ab1d07db9
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to benign Shopify URLs but are likely part of a link farm to improve SEO for the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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/pify?keyword=bar+graph+and+line+graph+worksheets
    • http://files.pattayaguesthouse-hideaway.com/uploads/1/3/1/1/131164567/7ecde486ad98d.pdf
    • http://wosad.guzmansdancestudio.com/uploads/1/3/1/4/131452883/19f6827bf3bb5.pdf
    • http://xomamudux.kroadcottage.net/uploads/1/3/2/8/132814930/wemimovis.pdf
    • http://files.horsetrekmongolia.com/uploads/1/3/1/4/131453053/3761080.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6056/0025/files/vojiluzaxuzibekubote.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/ropeja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0103/files/lenaxagiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/7256/1050/files/sivamolud.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/lysogenic_cycle_of_bacteriophage.pdf
    • https://cdn.shopify.com/s/files/1/0437/5907/5477/files/53961760324.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/gususuwodubemumiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/62167578719.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_off00005cc8.bin
80f580c6e75f8f7b20c7de5469a3ada1c33660c037e5b8786b218531bfb7f577
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC8 5428 bytes
font_01_sfnt_off00006f42.bin
c128480736c9e0eeaa4736098122d092edd8066d6f22853d9bb9e939e7f8df11
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 10132 bytes