Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f23549d0450b57…

MALICIOUS

PDF

49.7 KB Created: 2020-08-30 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb7cb1123295e2d81bb0a086c971947 SHA-1: 4803d6e26de5a5256d61d23c403b020b25a8d377 SHA-256: 81f23549d0450b57b5d675a64f6bcb861174847278807cfb6796ca8b47a82f5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=fbla+entrepreneurship+study+guide'. It also contains a PDF link farm heuristic, with numerous links to Shopify domains, one of which is 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf'. The document body, though heavily obfuscated, contains text suggesting it is a study guide, which is likely a lure to encourage clicks on the malicious link. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or redirection attack.

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/wix?keyword=fbla+entrepreneurship+study+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf
    • https://cdn.shopify.com/s/files/1/0443/1849/0780/files/kalunevenevuxonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/74252852374.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/lumumaniza.pdf
    • https://cdn.shopify.com/s/files/1/0430/8674/1655/files/72975601913.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/tanagadajisitevirimatixif.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/mexotizaxovexo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/netewew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/dojimot.pdf
    • https://cdn.shopify.com/s/files/1/0428/7869/7631/files/export_keychain_passwords.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/78182935221.pdf
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/zobowetu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007869.bin
98d11cac7c64a8d71907d3e26cfd723d670f77c18107a5412b47737771377cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7869 5192 bytes
font_01_sfnt_off00008a01.bin
59a7455dd7b76edc4c35e2eef83382322e0ab93999e9adcac060790dc7ed05ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 9916 bytes
font_02_sfnt_off0000abe3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABE3 4324 bytes

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