Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e4d429eeffe1b4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-25 14:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d00fcbc4c0efd569a073474bddd7cb0 SHA-1: 5105b92455f5072111427e826532c1fd069eaa07 SHA-256: 76e4d429eeffe1b4bc822d26639b61795d6ba55c098a5a337f4bfec22051e0c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Avira phantom vpn pro apk full' and the malicious URL, suggesting a lure for downloading potentially unwanted or malicious software. 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=avira+phantom+vpn+pro+apk+full
    • http://misefiz.cambridgeintlschool.com/uploads/1/3/1/3/131383541/bced432f6.pdf
    • http://files.nccsdonline.org/uploads/1/3/0/7/130775649/simerim.pdf
    • http://files.westmountwildrugby.com/uploads/1/3/0/7/130740323/89f42d093.pdf
    • http://files.cwlawpartners.com/uploads/1/3/2/7/132741144/68aad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/xuxegipamalemuxad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/95518842665.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/63377235315.pdf
    • https://cdn.shopify.com/s/files/1/0430/8176/0935/files/zazukutasiwawixidupowaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/tegamoditodi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4953/2057/files/the_brief_bedford_reader_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1388/8405/files/arizona_a4_form_help.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/37298741316.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/performance_appraisal_hrm_definition.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/56373938441.pdf
    • https://cdn.shopify.com/s/files/1/0464/9605/5448/files/anabasis_saint_john_perse.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7133/files/dipiw.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_off00006b7f.bin
dca9cead018fa54c22b376d6271df53a7f98365aa39f805ee6338da3472a56ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7F 5076 bytes
font_01_sfnt_off00007c9d.bin
cd714bebef57b3c47fff9b637c4cac385ac65acf6709b99088b6ae5a557a33a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 10128 bytes

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