Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e8c66c7b0795da…

MALICIOUS

PDF

40.3 KB Created: 2020-08-14 22:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb121c7e41250af549a989b1a8f57a2 SHA-1: 69d2e5a0cbac86c63998193a4805dd1a4371a06b SHA-256: 85e8c66c7b0795da388637c968b017f81fea7840ba7dd226a26c57820b9be88d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external websites. One of these links, ttraff.com, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to drive traffic to malicious infrastructure. The presence of numerous Shopify links, some flagged as benign, may be an attempt to blend in with legitimate 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.com/pify?keyword=wrapping+paper+sheets+cheap
    • http://belojikim.whitneylawrence.com/uploads/1/3/2/7/132741099/4693385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6798/1474/files/alchemy_emperor_of_the_divine_dao.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0608/files/17869771288.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4750/files/fijamusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/todivorepevujimukogutijix.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7239/files/paramore_ignorance_lyric.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/14286377929.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/gisalotojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/bruner_theory_of_cognitive_development.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/richard_hofstadter_anti_intellectualism_in_american_life.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_off00005f33.bin
8a6baf8020d35c8fce2095ff1ace35b15099b49ee15d0c6ae385965f6b3bb903
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 5176 bytes
font_01_sfnt_off000070d4.bin
be5c65e14635dcbffe05227fb24879bde529d30640d2f0f2f8772e5286422945
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D4 10544 bytes