Malicious PDF — malware analysis report

Static analysis result for SHA-256 115f036ba90f08e9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 08:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a64bde2ed2201b77f2842d70e6df8d01 SHA-1: b0c93f0679a22ce891a424fa483dea76f4c937a8 SHA-256: 115f036ba90f08e9bb8b227bd98b6fc7547b6ebbf02697d2e6e557af739d7e66
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which are benign but serve to obscure the malicious one. The ML classifier strongly indicates maliciousness. The embedded document body text, though heavily corrupted, contains the malicious URL and references to PDF charts, suggesting a lure.

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=r134a+pressure+temperature+chart+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e3ed1f_25c21beb5ce24a44ad71a3266289f507.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba1c95c30cf7409fb381c6f1eafe6daf.pdf
    • https://static.usrfiles.com/ugd/ec0c41_ef5f0a1500f64b4c80ae09dce8baa547.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_79057ac0475a4d3faaf327651e9d6875.pdf
    • https://static.usrfiles.com/ugd/b8c837_55ccc61bb7a942039f0ba64841579924.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/87732211862.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/automatic_voltage_stabilizer_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/44603158743.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/javascript_binary_to_decimal.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/86350568486.pdf
    • https://cdn.shopify.com/s/files/1/0434/5266/1912/files/xolivifalubiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/53835481119.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/gpa_calculator_uky.pdf
    • https://cdn.shopify.com/s/files/1/0440/6873/3078/files/afcat_ekt_syllabus_for_computer_science.pdf
    • https://cdn.shopify.com/s/files/1/0436/6182/0054/files/22716437969.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_off00006712.bin
d635b31f18035a9e1c8efe4cf38716ff137035764f075ee3ac2f8f0c36464fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 5676 bytes
font_01_sfnt_off00007a3b.bin
0e0bfe4fc5da256c1944743eac90a0f55019de41a56768ad2d35ab28f6e75214
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3B 10112 bytes