Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1ec6e5639e1a50…

MALICIOUS

PDF

43.8 KB Created: 2020-07-31 03:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 536e548f63de463212bda636277e49c7 SHA-1: 2fa86e60d722c5ee4d2e28101c3be4255ce9bf36 SHA-256: 0f1ec6e5639e1a50c7108920656af980f7e97ea78023a48118a7a0c410214374
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. The primary malicious link identified redirects to a known malicious infrastructure. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to manipulate search engine results or lure users to malicious sites.

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.cc/pify?keyword=different+shapes+and+their+names+pdf
    • http://files.brownsnotebook.com/uploads/1/3/0/7/130739351/674023.pdf
    • http://files.nizhonipropertiesllc.com/uploads/1/3/1/3/131398428/japedusi_mimabigolu_gosofawabize.pdf
    • http://files.nebraskaeasement.org/uploads/1/3/0/7/130740231/8603856.pdf
    • http://files.elementmaster.com.au/uploads/1/3/1/1/131163533/29f54017b0c2.pdf
    • http://files.leadershipsystems.com/uploads/1/3/0/7/130740210/9731581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/28134278878.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/bawuvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/7446341499.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/82235892421.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/lidupuvajinadubonek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/95678847985.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5262/files/woxomumoxagukoropuzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9009713252.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/forikeratibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/lonisi.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_off00006f5c.bin
acd0ec579e5dbc9f842f6d4562c88783c2a43eb24cb8067bc74b0f0faf4d93e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5C 4924 bytes
font_01_sfnt_off00007fe5.bin
b34f4be7a2ce9041c2078941acadd82e86bec770a1ffe8f749c490de83b842d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 10064 bytes