Malicious PDF — malware analysis report

Static analysis result for SHA-256 79143a315ea31da2…

MALICIOUS

PDF

49.0 KB Created: 2020-08-04 09:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72b1c4ae9592958cacb3c40d086ffcc9 SHA-1: 4b2f3ce4424bee40281e71a39c26dbc58deea662 SHA-256: 79143a315ea31da21453efa29f26c32bd740ed58dbbad4ee310ff2334728f5e1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to malicious sites. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=the+black+boy+richard+wright+pdf
    • http://files.aj-marketing.co.uk/uploads/1/3/1/4/131407918/bibozebavarezob.pdf
    • http://files.myoridefitness.com/uploads/1/3/1/4/131454916/763051.pdf
    • http://files.epictherapyandwellness.com/uploads/1/3/0/7/130738892/7110317.pdf
    • http://vikuvej.bwitched.com.au/uploads/1/3/0/7/130776483/mukukov.pdf
    • http://files.bowentherapywithann.org/uploads/1/3/1/4/131409090/lobezesolime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/24157966980.pdf
    • https://cdn.shopify.com/s/files/1/0440/9557/0072/files/vapusuripapajesovikuvutin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/nunososipij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/doxuvomuzivogixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/dalinoganugekava.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/64046458948.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/9775089030.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/49465686467.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_off000081da.bin
033f3b42258f9c98b5a1dac9e80d712899eaf77c8e1ad90025c8cecc8fa283ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x81DA 5584 bytes
font_01_sfnt_off000094ee.bin
c13edc8e2898a8674296abb92882065284fbfc24262493ca7e2bef9c51f5990e
pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 10076 bytes