Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c6aa6890127780…

MALICIOUS

PDF

42.3 KB Created: 2020-08-02 12:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da10a57add3e8d7acb6a367e9c1d9026 SHA-1: e132b117f5d18ab475efdf1de609da163451d1cd SHA-256: 81c6aa68901277800d158fea0c710bf98c30c312626695c23340b58880426bbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.cc/pify?keyword=morel+mushrooms+wisconsin, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to lead users to malicious content.

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=morel+mushrooms+wisconsin
    • http://files.flexosupply.com/uploads/1/3/1/3/131380029/fipijinu.pdf
    • http://files.penncrestlions.com/uploads/1/3/1/4/131454106/7272726.pdf
    • http://files.focusonthegood.com/uploads/1/3/0/7/130738769/jeluzulatawola-teluzinowuked-nikemogozexe.pdf
    • http://files.westernlogcreations.com/uploads/1/3/2/3/132303083/nigodujirusibunasiju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1143/2867/files/gugejewevapuxax.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/argumentative_essay_rubric_high_school_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/demederak.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/pumikutuwum.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/8425917201.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/68946505744.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/51917319775.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/93117638004.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/jewiwipapixolidomitafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/regepolisijezu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/51285765788.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_off00006718.bin
2987e6e9147c5738010195b74fd92143c49678053eafd449b17663b8d49d8cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 4924 bytes
font_01_sfnt_off000077ce.bin
d8caf30b2a992df84c268f2c5e849ec6b3a0bdb3551f0c1dbfdd94ffa69abe3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 10356 bytes