Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fa59a2a70c8aa0…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 21:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3354950f3f5106ace4b33848c3b99a7c SHA-1: fb7892c1c30124003a3f13d71e138bb8515d7441 SHA-256: 56fa59a2a70c8aa047cbcce391fde380cfd7a0036c798626c87508af32383c21
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to lure users with search engine optimized content. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious external sites via these links.

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.link/wix?keyword=abbott+architect+ci4100+manual+pdf
    • https://static.usrfiles.com/ugd/b8c837_80314a30d10c4facaac57f5f2912e18e.pdf
    • https://static.usrfiles.com/ugd/bb13a2_bf9ad64e5e394f2fa8d8fb86e80887e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b8d4db34fb94d73a78dfc389e551d89.pdf
    • https://static.usrfiles.com/ugd/5b9365_dc952652aca848a8957f7f20a16d24a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5499244c1e324821b1d722226c25bdcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_4efb80aefb604543b9579b418baff67c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76cb41a89294e1ebad1e8a4502a6ebb.pdf
    • https://static.usrfiles.com/ugd/253000_0a04062ee5d944479217915cbe6f0c9e.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_354757cd5ee1431b9ecf52f2b96837e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab90a2c16934972befaab0793c90418.pdf
    • https://static.usrfiles.com/ugd/80bfa9_6080c5272dd5473eb24d9cc1213272e3.pdf
    • https://static.usrfiles.com/ugd/32777b_c54e42b201a843639b23d52ca36ac4b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_300a1206121140febaac188c4b35bbf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_683867d6f6ab4a2c85a21c86e6755aee.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006084.bin
aeddbce352e57074093c885481530ebf6faa13218e7c9314fc77a9932d55503d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 5628 bytes
font_01_sfnt_off00007380.bin
4f583cab4b2be3262d58f1ab8ac2df808fbf664e253d0128fb61ee3c434fe20b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7380 10456 bytes