Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb4cdc88b1789a1…

MALICIOUS

PDF

74.7 KB Created: 2020-08-04 11:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df38d258c92491e1d7cdb3e1dab2e4c6 SHA-1: fb686dc88677e78b917f2a307f3196c05f410f52 SHA-256: 6fb4cdc88b1789a1af9c7b750ba21eb928db8bc81ab45c587ac370ae3e2b19a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign Shopify domains. However, one URL, 'https://ttraff.cc/pify?keyword=legal+argumentation+pdf', is flagged as a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites, likely for further exploitation or phishing. 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.cc/pify?keyword=legal+argumentation+pdf
    • http://files.yellowbroncocreations.com/uploads/1/3/0/9/130969334/1731452.pdf
    • http://files.brendanprout.com/uploads/1/3/2/6/132682892/valolumeralusapegos.pdf
    • http://files.mikemorseconstruction.com/uploads/1/3/2/7/132740172/datoda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0409/2828/files/zirabavaro.pdf
    • https://cdn.shopify.com/s/files/1/0440/9815/8744/files/66966763015.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/34895317452.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/bekudividutidexibetira.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/sifokelenadotada.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/88646581039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9114/9475/files/democracia_liberal_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/cambridge_essential_english_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3899/6642/files/tewapajid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wotedosepano.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/46420337051.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/79310425569.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_off0000e823.bin
2bb518755347528610c63bb0b6cb2a3f1f4fdfad7c816c19fe43aff712465461		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 5124 bytes
font_01_sfnt_off0000f980.bin
710dff294d6b8e8a5e786cc06a689979af04d9c88df9d4c150a7f05c539dee6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10624 bytes

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