Malicious PDF — malware analysis report

Static analysis result for SHA-256 1232b642324da9db…

MALICIOUS

PDF

45.5 KB Created: 2020-08-08 03:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9587c2648c86419dfbf2fead058e6ab SHA-1: ee1871477734596c048c259de4eacb183be8b8fa SHA-256: 1232b642324da9db41e8451b0e312ab0c86d849ae2ebc8c5ccb2b1c9d43550ea
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 point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. 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=apache+hive+books+pdf
    • http://files.singaporenails.com/uploads/1/3/1/6/131606688/mekefarodo_xaged_fudejot.pdf
    • http://files.drsterling.net/uploads/1/3/0/8/130814475/3d2d104696c63f.pdf
    • http://files.libertycommercecenter.com/uploads/1/3/0/8/130814052/vazogenebubus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/wosojebujanewijiromiviv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/23949713271.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/gixil.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/mawatavefudugeveja.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/40057617070.pdf
    • https://cdn.shopify.com/s/files/1/0448/0725/8269/files/extended_metaphor_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/pdf_file_reader_apk_app_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/63568518622.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/36076210930.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1491/files/67688779329.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_off000074a7.bin
4893f8d9f7874ad1e8e48297ce07257f306edae9e74b5f9526ab17952ada9c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A7 5368 bytes
font_01_sfnt_off000086ed.bin
b79c91f45ec3201fceaee879c039e027a66bf9fa9bdcc03066c5e2f71f06d706
pdf-font-stream PDF embedded font (sfnt) at offset 0x86ED 10016 bytes