Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa58a42eef90d6a…

MALICIOUS

PDF

36.8 KB Created: 2020-08-29 09:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df2d28fd9f0a83faeae736b90ada97b1 SHA-1: 94c99ac6e3da57805bd7cbf5f34a3fb3093b75d9 SHA-256: 6aa58a42eef90d6ab8cbb3be36ce275f7c91cf47240cc2af3324f0da58b3c05d
154 Risk Score

Malware Insights

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

The PDF contains a link farm of multiple external PDF documents, identified as a PDF SEO link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristics suggest an attempt to redirect users to malicious infrastructure.

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=marketing+kerin+test+bank
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e41db60785a940b79d36a42069d4c010.pdf
    • https://static.usrfiles.com/ugd/b8c837_a84918c81c784b88a640d33f38f09a31.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a37ec38b1a34ec982127b418537f6c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f250c19557d4e928885e6a6982485ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_15186ec41161480583a176251b50e5bb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/43672322121.pdf
    • https://cdn.shopify.com/s/files/1/0438/3932/4325/files/28103444742.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/57267666304.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/455412011.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/54749667537.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/billboard_top_100_1988.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/tigijivibisuxaxotaxerobub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/bible_bookmarks_to_color.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_off0000521c.bin
7e2f4ec93dfd44e76e427e7de845de1b5e539f7fd9dfcb253de995dfae11fc89
pdf-font-stream PDF embedded font (sfnt) at offset 0x521C 5032 bytes
font_01_sfnt_off00006353.bin
6d556ac3a049a2797b76084f12a0a0b39955ae3bd022eb45ee45610f064466d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 10424 bytes