Malicious PDF — malware analysis report

Static analysis result for SHA-256 5886445a143fcebd…

MALICIOUS

PDF

51.2 KB Created: 2020-08-09 04:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05d3cc4dbfe71cafc6ed7c15689f8ee9 SHA-1: 3f8702ccbc2bf8459b5fa49f65bc2ed468e1a195 SHA-256: 5886445a143fcebda8a149a5bb98e21b1956063431e592586d325b49cc1a3be3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com and redirect through ttraff.ru. The primary malicious redirector URL is https://ttraff.ru/pify?keyword=english+reading+comprehension+for+beginners+pdf. This indicates a social engineering tactic to lure users to malicious sites under the guise of educational content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=english+reading+comprehension+for+beginners+pdf
    • http://files.bakerstreetuniverse.com/uploads/1/3/0/9/130969446/pebimi_jokosevotiz.pdf
    • http://daxaduvos.2400f.com/uploads/1/3/0/8/130814328/defoveral-tedoma.pdf
    • http://files.fatherkeyes.com/uploads/1/3/0/7/130739625/kewuzol.pdf
    • http://wunekej.dfgcreativeexpress.com/uploads/1/3/1/6/131606727/5261230.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/piwitodefuxabapar.pdf
    • https://cdn.shopify.com/s/files/1/0432/2964/2911/files/tofiwokunutu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/bijixad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/10253129624.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1892/files/alfonso_reyes_poemas.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/juretijuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/91265033676.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/buwov.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/rabifiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3523/8301/files/78961540426.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/53338774970.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_off000089cd.bin
831a87f3911b85a29f088e94d3fe55eb8b9c300c5b7fdff8e0031e51e0f57dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 5668 bytes
font_01_sfnt_off00009ceb.bin
1d4011233c0d9f5abe6115f526836f7ba7cb7d6a4cf79a008aa0ad0c622836ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEB 10272 bytes

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