Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a79bcb7e4fcb32…

MALICIOUS

PDF

44.1 KB Created: 2020-07-29 04:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8836d9517e906a1e4fd623d91bc32d4f SHA-1: 6b07cd459b73f0ebf87a4ad92962366a5ca822e8 SHA-256: 80a79bcb7e4fcb32d46fa7631205dfd813aa484b95b2d74f05dec993409ce52f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though obfuscated, suggests a lure related to tax worksheets. The presence of embedded URLs and the heuristic firings indicate an attempt to redirect users to malicious infrastructure, likely for phishing or to download further malicious content.

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=schedule+d+tax+worksheet+example
    • http://files.mosston.school.nz/uploads/1/3/0/8/130814877/0986f8c.pdf
    • http://files.plekhanoff.com/uploads/1/3/1/3/131381414/4b97c4f494d9.pdf
    • http://files.metroeastinterfaith.org/uploads/1/3/0/9/130970009/linuwanewopa.pdf
    • http://files.mrperformancetraining.com/uploads/1/3/1/1/131164157/pedigeje.pdf
    • http://files.carolineshanley.com/uploads/1/3/0/7/130738924/246df8b4dd9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/65413960723.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/72665171893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/wefonaxevibigotineboxuzem.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/95394580584.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/kebexiwowalumipofitetaba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/mejudoniziwuleruvadava.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/18113857430.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/63076126521.pdf
    • https://cdn.shopify.com/s/files/1/0435/9372/8158/files/kewiwapafegaj.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_off00006e0d.bin
18479c86a07dafb226f0fa769c18239dc1df2b93d6a062678f32369be3f28f86
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0D 5368 bytes
font_01_sfnt_off00008059.bin
5956cc6318c50da1731c763867b55c9f792e9e1b04331bd029b688451b777eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8059 10220 bytes