Malicious PDF — malware analysis report

Static analysis result for SHA-256 880b77186593bc15…

MALICIOUS

PDF

34.0 KB Created: 2020-08-31 04:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf86a3eee87bde14fa922debca2491eb SHA-1: f7a970f36c5d915e9d7912319df959b28423a36b SHA-256: 880b77186593bc15bfdde97b6b7509fe7d56788375b238c82539f2f8c2b100f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a search result for 'autocad 2d house design' which points to a known malicious redirector. This suggests a phishing or scam attempt to lure users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links supports this. No scripts were extracted, but the primary maliciousness appears to be the redirection via the embedded link.

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.club/wix?keyword=autocad+2d+house+design
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/74537720352.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/8.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/gimitiwenenimutetiveluluf.pdf
    • https://cdn.shopify.com/s/files/1/0465/3626/1782/files/76288238762.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/vajabo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9194/files/lugidux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/posapuraledimazixowapam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/bailey_s_story.pdf
    • https://static.usrfiles.com/ugd/10a4aa_2eb4da4641ca4f30916f691028522730.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_fc3ba437f9534b1aaae466e713076d41.pdf
    • https://static.usrfiles.com/ugd/628a76_607e7269366e4e11b4dbe0fb37c5a3d6.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_off00004505.bin
470f66e524e01a982e25aa890dcbed052d0c2349a2ee5b6e770318ae14761f07
pdf-font-stream PDF embedded font (sfnt) at offset 0x4505 5192 bytes
font_01_sfnt_off000056a4.bin
a677e00cae3f2e429100fb1a08b95dc391547e2ee207ee7b03c0be9154b719ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x56A4 10436 bytes