Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec621a2550a88a6…

MALICIOUS

PDF

33.4 KB Created: 2020-08-19 03:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0115d452ecb171d82fb2c27f146f99d SHA-1: af1c72e946b7d036a0df0591e1925778fc5be011 SHA-256: 6ec621a2550a88a6b9773bcf505b3c44b4345c23599a718f82d41bf1d3920d61
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 of which are designed to appear as software downloads but redirect to malicious infrastructure. The primary malicious URL identified is ttraff.ru, which is flagged as a known redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to malicious sites, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=kundli+pro+software+apk
    • http://fumomexi.animalacupuncture.org/uploads/1/3/2/7/132712615/busan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/66757947925.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/mark_henry_them.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/20811673403.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/bupenebidefibuneku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0447/1973/4938/files/kraft_paper_sheets_a4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/workforce_development_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/lutozezafevu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/67633615320.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_off00004572.bin
40ce0230cf509a81304a6cb0fb967d33683cd8493289be0309269a77ef4fe2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4572 5160 bytes
font_01_sfnt_off00005719.bin
bb1ec5f6b35a65dbbbf8ed07cdf4af78ad59d5b836dd5adc335f8c54f2ac63a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5719 10072 bytes