Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5edda6fdbc15d51…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 22:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1266b5931a8b7f7bf40c39c3729e19f5 SHA-1: 2db0b9b175cc39bf99fc4f7e4dee9663d6735f1a SHA-256: b5edda6fdbc15d51e0bf21300d20abbc8db0a49af499ff7609c3556e1ab3db07
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. This suggests the document is designed to redirect users to malicious sites. The presence of a large number of links, many hosted on 'cdn.shopify.com', indicates a link farm strategy, likely to obscure the final malicious destination or to improve SEO for malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=bell+bottom+movie+kannada+song
    • http://files.spiritwalk.info/uploads/1/3/1/4/131452935/3407478.pdf
    • http://files.guerrillazoo.com/uploads/1/3/0/7/130739616/5761426.pdf
    • http://golagaj.doggiestylezinc.com/uploads/1/3/1/4/131407995/pesebefudupavav.pdf
    • https://cdn.shopify.com/s/files/1/0452/1564/5856/files/que_son_los_antimicoticos.pdf
    • https://cdn.shopify.com/s/files/1/0436/7722/1017/files/xutusuwob.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/8478978220.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/sopuxofagetikelalopi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2138/3333/files/23885031601.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/67860450978.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/8751603013.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31670740491.pdf
    • https://cdn.shopify.com/s/files/1/0434/6186/9733/files/asma_bronquial_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/bepamasajijusilozejupa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006664.bin
d5cb52e6e15fa9a49372f5807cc05c1076f1a6666ca190b1b67fa1e141985ccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6664 5360 bytes
font_01_sfnt_off00007895.bin
40c5721bf9c5ab3c323c0f07c746757ff2829a5f8c9be8526b1d280b4fc01114
pdf-font-stream PDF embedded font (sfnt) at offset 0x7895 13036 bytes