Malicious PDF — malware analysis report

Static analysis result for SHA-256 4249f173f6377cba…

MALICIOUS

PDF

50.0 KB Created: 2020-08-14 14:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ccd52a9005c61a406b314f0eaa87f1 SHA-1: 82c0234adde8981fc53c441405cff47fa10e1815 SHA-256: 4249f173f6377cba9b9fbef10c5744249fc8f8a1b1cecb06c5c5045ce1405b41
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Telugu bajana video songs'. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm for SEO manipulation or to obscure the final malicious destination. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=telugu+bajana+video+songs++come
    • http://files.erinboake.com/uploads/1/3/0/7/130776718/maxul_zefanenumu_ruxuxotevar_jazomagudigem.pdf
    • http://dituge.sfoshibori.com/uploads/1/3/1/3/131398020/numusojilekori.pdf
    • http://sajefowe.principledprincipals.com/uploads/1/3/1/6/131637016/gunitopejijo.pdf
    • http://files.broughtoncambridgeshire.com/uploads/1/3/2/8/132814342/3113626.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/investment_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/vugepaxakobidivado.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/daxigenofakosi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/14087757155.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/23074922691.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/47249028167.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/lusomine.pdf
    • https://cdn.shopify.com/s/files/1/0439/9818/3582/files/catalyst_characterization_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0446/2634/6147/files/social_security_tax_withholding_form_w-_4v.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/35323203412.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/bubupebizofitikaloxogopar.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/91381814625.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/glances_apple_watch.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/
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/23074922691

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075a2.bin
e13efbfbe97eb4082dfbf5b71be455d2b48784b8c952a0d2e20e75846c957743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 5192 bytes
font_01_sfnt_off00008734.bin
c2467b099481b56a614d9f5a4e1ac0cc16aa565590d59ac00c50c032f5e4853f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8734 11472 bytes
font_02_sfnt_off0000acf5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF5 4324 bytes

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