Malicious PDF — malware analysis report

Static analysis result for SHA-256 941343cff623b4b8…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 21:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a70df9b14a2526033dbe66abe7e04d19 SHA-1: d0572e18975950b28b5057e62fe9f9c9a3a085c7 SHA-256: 941343cff623b4b8d0bf8a293eccb5a550f658dc42dd634289744fcdfa2df7e6
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=time+connectives+worksheet+for+grade+4'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on Shopify, to potentially obscure malicious activity. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=time+connectives+worksheet+for+grade+4
    • http://borok.michelecrater.com/uploads/1/3/0/9/130969600/jukesozotozu-rizaxokageb-dujexegus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/wopeboxatavoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/essential_idioms_in_english_new_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/1846/7997/files/38519991641.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2434/files/aprendizagem_baseada_em_projetos_livro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/83796580568.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/49453027058.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/fubikulisovazol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/93819852267.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/87621596329.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006028.bin
f709ebfc7362410c16beaaf896360d16733da00ddf5ff45aecb8275ca4b4abfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6028 5656 bytes
font_01_sfnt_off0000734b.bin
7063a2de200e4992c02429387a21653be74aacb674324b942a4648112b9c5c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734B 11040 bytes

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