Malicious PDF — malware analysis report

Static analysis result for SHA-256 8588d96cd82d8c7b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 12:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4aad710ee195193afa5c6e2012ac1a SHA-1: 1e0b2b7497762206a394e001096ec6f73c338ea8 SHA-256: 8588d96cd82d8c7b31c83c69b273c04d03726cb9adcbf4c181504fdf6ff35884
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=behind+the+beautiful+forevers+themes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/berobefawupusozafeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/wobomumaremusolafe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/54816895433.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab8e1f2a34484dd19469f47c53a1f211.pdf
    • https://static.usrfiles.com/ugd/3649d2_89dfbbedaf0d47fdad0e428548dbb45d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5334062b76041b4906fa610bd60d58a.pdf
    • https://static.usrfiles.com/ugd/b8c837_89deb405e9c14ee8831dc4f28eac3b67.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4abe030a28849f59177128ae9d76235.pdf
    • https://static.usrfiles.com/ugd/6cf392_45499d7f132e43c7901992693846feb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_46fcd9b0a21a4915936cc0e767b0b75e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0564db30819642d980ce7fa014338bad.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e4ed6d1e52349b0913d6c94bb1d105c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3365360b4b46548114c78add366ef9.pdf
    • https://static.usrfiles.com/ugd/b8c837_aaf9192b759d4957b97fc0fac42a4e34.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_off0000681d.bin
f623aa6e0bd40fa88e59829bdd4d39e99b5d1db109d99aeb0c7b07b090b89057
pdf-font-stream PDF embedded font (sfnt) at offset 0x681D 5396 bytes
font_01_sfnt_off00007a4d.bin
d77594ef49e712fa555235e0be10f9dda37f37ed568804eacdc97f8696389299
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4D 10156 bytes