Malicious PDF — malware analysis report

Static analysis result for SHA-256 73deb91b8f8fc21b…

MALICIOUS

PDF

39.8 KB Created: 2020-07-29 15:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12e3285cfc5c50f2642d6e112e4558b SHA-1: f681871d3eab6f26a17c82e9c6ec31b7e80ab523 SHA-256: 73deb91b8f8fc21b48036b5623776b7f718e7a16e01264685e198f08651fec3e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

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=philosophical+and+sociological+perspective+of+education+pdf
    • http://files.philipestrada.org/uploads/1/3/1/4/131406448/judofa_wokelow.pdf
    • http://files.vickylneal.com/uploads/1/3/2/8/132815882/nemat.pdf
    • http://files.thunderrunners.co.uk/uploads/1/3/1/3/131381518/tijajopedizevepud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/golare.pdf
    • https://cdn.shopify.com/s/files/1/0429/2755/4723/files/lilelizavevuvomofoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/83568447086.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/pevaxepiturikobawev.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5222/files/fofibezavewulufisan.pdf
    • https://cdn.shopify.com/s/files/1/0436/1319/2349/files/dubuxuxefeni.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/39923068749.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/bosezexoronarifisujalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/426851441.pdf
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/temowibina.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/95119885152.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.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_off00005a8b.bin
9c9b6ce37f6b2da2162957c2beb1ee14cd721d4ca8a2dd974ecf4281fe68b782
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8B 5360 bytes
font_01_sfnt_off00006cb9.bin
5d023e0231080829083a07808d3ab88f219fcc85a22cc0910a944924d47d8d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB9 10428 bytes