Malicious PDF — malware analysis report

Static analysis result for SHA-256 75447d4b7606a5d0…

MALICIOUS

PDF

47.0 KB Created: 2020-09-06 20:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfcbefd6898a1c27f1530db8e80abbd1 SHA-1: fcc85daf9ce5f57f5db0c6c2f1f3ab0814c94ad4 SHA-256: 75447d4b7606a5d028d6eb01b1d3e7f30970b2c0e6c43ba1f43ce5f203420fd0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.me/wix?keyword=announcement+text+with+question+and+answer'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with the first identified as 'https://static.usrfiles.com/ugd/6350c7_c003f5532c8a46f99b4b89ddb84bd2f6.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to direct users to malicious content.

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.me/wix?keyword=announcement+text+with+question+and+answer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/6350c7_c003f5532c8a46f99b4b89ddb84bd2f6.pdf
    • https://static.usrfiles.com/ugd/6846fe_f5731c7c476e4bba93a15a8b85b187d3.pdf
    • https://static.usrfiles.com/ugd/f9d4cd_c854141be106498682c42279b8f83bf2.pdf
    • https://static.usrfiles.com/ugd/8acad3_9314685955734e9b8fc32004ecaa7f9f.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/7727971631.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/xaluzenifaxatinivifo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/assassin_s_creed_syndicate_size_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/2543/1709/files/clinical_anesthesia_procedures_of_the_massachusetts_general_hospital_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/81899233926.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4297/files/blackbird_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/blood_sugar_test_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/9376/1956/files/xidonubowubavomam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/telecommunications_distribution_methods_manual_13th_edition.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_off00006c6f.bin
559319ce9c0eb72880265ca5fe44de3ba55954e52b79c236f0b7f7c383af26b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6F 5304 bytes
font_01_sfnt_off00007e56.bin
2ef052bbb21d89a12c01656befaa8b65dcbf9d89bd8311050e15eb7957b4d6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E56 10144 bytes
font_02_sfnt_off0000a106.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA106 4324 bytes

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