Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc61b51349b2daf…

MALICIOUS

PDF

34.8 KB Created: 2020-08-01 06:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb76d8fb90c2937e6b0afa5ca3e2051 SHA-1: 95f71ad264a512a73792a1326dfca2345e0eab2a SHA-256: 5fc61b51349b2daf0b86974ca7daa12d0515ca43aca9c632fa39e63bea147506
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 Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests the document is part of a link farm or SEO spam campaign designed 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.cc/pify?keyword=lowes+evans+ga
    • http://files.kylagilbert.com/uploads/1/3/1/6/131637255/7691661.pdf
    • http://files.friendsofkillarneypark.com/uploads/1/3/2/7/132712050/xapodowaxasa.pdf
    • http://files.spencerelliottmusic.com/uploads/1/3/0/7/130775828/sedoji-situt.pdf
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdf
    • http://files.twobirdscoffeeco.com/uploads/1/3/0/9/130969322/tiwunitorav_xogoteloluru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/taruganeposojututujeremem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1588/files/72058577442.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/98030159127.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/tesopakatuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/33929127796.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3396/files/jutozamij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/83921206591.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/2385134468.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/63680871169.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/34546448656.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_off00004c9c.bin
8b96e28c67eb357911e567d4d0f6a05cebca6c600205e7955a8d42fa9bd24903
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C9C 4816 bytes
font_01_sfnt_off00005d35.bin
c3e0b976b70086ee7789013da21044118482c2444d012875f72a28fb9651f3e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 9864 bytes