Malicious PDF — malware analysis report

Static analysis result for SHA-256 724cf75230faf37a…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 23:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265b25345cfd43efdfa548d151877ee7 SHA-1: 1c890572825e36f34436a8af4aee1c68033251f7 SHA-256: 724cf75230faf37a978348bddc3db4084177ed79dbd307cecb25b6e581ceba20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/wix?keyword=games+at+school+not+blocked', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the distribution of numerous links, likely to obscure malicious intent or to manipulate search results, rather than direct execution of a payload within the PDF itself.

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=games+at+school+not+blocked
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b78055f4d46e43aabdc759bd590ecc76.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_4808d374946e471eba91498fcc81b1ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_70397251cb4b4e688b91709fcbc6f7f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ae7500b4a6e419fb4371d4f923e6e19.pdf
    • https://static.usrfiles.com/ugd/c3f88d_2c4bb5c3adae4d6da48764e047d0ec1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50c5eb6719045658286e5b0bcf964b7.pdf
    • https://static.usrfiles.com/ugd/191a6d_299efcb22b86434db24fd69e9cc7bfc1.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/928133487.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/99436715044.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/nisinixafakodukifa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1776/files/73480265972.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/29555430687.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_off00005c64.bin
69f9fd057b93a139932acb1e50c976d76302f30e4ffee78566389741b181af2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C64 5316 bytes
font_01_sfnt_off00006e59.bin
b324b335a211cbefc5d7b17befd1f5dafa5372ea6e4c580ed66350e32211aeed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E59 9956 bytes