Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e88b4aa7415ddb7…

MALICIOUS

PDF

38.7 KB Created: 2020-08-21 15:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dcc3a087574a8f692195b183ca09a58 SHA-1: 60ed018579fc46edf10bc94765e5dc445b484ce6 SHA-256: 5e88b4aa7415ddb7bf5b0258fa4e9879a1b5b651cb8b17fb2bd1a437a930de3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, masquerading as a link farm. One of the primary links, https://ttraff.ru/pify?keyword=formation+blanchiment+dentaire+bordeaux, is identified as a malicious redirector. The document body also contains this URL, suggesting the intent is to redirect the user to malicious infrastructure. The ML classifier also 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=formation+blanchiment+dentaire+bordeaux
    • http://files.saintlawrencewr.org/uploads/1/3/1/4/131453255/4741528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2722/7036/files/93963513616.pdf
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/93455833315.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/lyrics_sharp_dressed_man.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/28302244916.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/ratimizerejor.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/physics_walker_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/43469414652.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/3929484355.pdf
    • https://cdn.shopify.com/s/files/1/0447/1151/0170/files/access_bars_sorular.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/antologia_de_cuentos_de_misterio_y_terror_porrua.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/begekefisarisonilobidiv.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_off000057bc.bin
7505380bb5de959b8698d40cbbb29cc501c0da2e9419f05f8ddaeb9b828dd7c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x57BC 5164 bytes
font_01_sfnt_off00006916.bin
80976789f5d65266dad3400cc06a989c5e8ecf56869dd2226fceae64f9ff50a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 10920 bytes