Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a6560e0016e190…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 04:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b5f57545313e12f56618cf4d1c4728b SHA-1: 9201e4e43a413fbbd02a326fa0cd27a816ad47e0 SHA-256: 86a6560e0016e190fad6852009468b67c6c4efc11b8431b7fad72a4e93276898
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external PDF files, many of which are hosted on static.usrfiles.com and cdn.shopify.com, likely as part of an SEO link farm. One of the primary links, however, directs to 'ttraff.com', which is flagged as a malicious redirector. This suggests the document is designed to drive traffic to malicious infrastructure, potentially for further exploitation or phishing.

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/wix?keyword=eleanor+and+park+free+ebook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9ea91e_25fa6308dca54352a7b18833920d2a17.pdf
    • https://static.usrfiles.com/ugd/b8c837_da1b8b8407d442d7998881b1a0444216.pdf
    • https://static.usrfiles.com/ugd/804ff6_0ea7bec0c4d4402aa8259b10c55669e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e59049d69c4b45eb975085bc52814b9f.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/78346384687.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/funding_for_small_business_startup.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/arnold_ehret_francais.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/men_in_black_free_online.pdf
    • https://static.usrfiles.com/ugd/3e87bf_b5b4f2fedf8146bcaa346f02d6494d60.pdf
    • https://static.usrfiles.com/ugd/a1fb72_db0c46a830284329b2c4518bb8cac28c.pdf
    • https://static.usrfiles.com/ugd/a43ec6_687e4fa0409c4008b569ae327463e192.pdf
    • https://static.usrfiles.com/ugd/4f270c_ec9c2d53777042bf9925ba4b5f627057.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_15575acbfb31477f9484f5a40594c442.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_140e23f5748f4486adca0d32c8ca938d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d5abccfc9204656b8b2e684fdb2f274.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_off000064c3.bin
8e1c37fff98d71c2d335afcab3291e812bcff1dddfda7498bb5af197782c496c
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C3 5020 bytes
font_01_sfnt_off000075e3.bin
182ffa82951514af568fb4af2c6bc5f055c2c9fc06329ebd914d019f53e2031b
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 9908 bytes