Malicious PDF — malware analysis report

Static analysis result for SHA-256 7081715eec956b89…

MALICIOUS

PDF

40.0 KB Created: 2020-08-08 06:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3fe14222432dd74d8b87e2625c11a1 SHA-1: 687e04a6c878f0a5021e07a091770724a7f4faa1 SHA-256: 7081715eec956b898e7f9b7e8cc32fa653806f73e502afb2f98097887db42842
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to host phishing content. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics suggest a lure to malicious infrastructure.

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=que+es+holismo+pdf
    • http://files.burchfisher.com/uploads/1/3/2/8/132814138/linigitupak.pdf
    • http://nonib.camparrowhead.net/uploads/1/3/0/7/130775162/3da0b86c5ddf265.pdf
    • http://files.novadesignandbuild.com/uploads/1/3/0/7/130740044/lofidogovubebad-fanijopeve-zogew-mobezovobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/tijob.pdf
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/joranomibap.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/17135779427.pdf
    • https://cdn.shopify.com/s/files/1/0439/9392/3742/files/reversed_carnot_cycle_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/bucoliche_testo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/vumesejekuzugeputuwig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/11161397312.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/brendan_brazier_thrive_energy_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/lorelikamevidalalifupad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/denakanapodozogefa.pdf
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/anticipatory_bail_in_up_notification.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_off00005dee.bin
da38cbf2f4fa0e5a99a9e69364ad2fcda18b4712dd8a3fcd4fd87cd4a4d95994
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 5036 bytes
font_01_sfnt_off00006eef.bin
6cc68b0167c3feea36710b03468d288b42cd80e4247c491f6a3d987bb72efc49
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEF 10904 bytes