Malicious PDF — malware analysis report

Static analysis result for SHA-256 663fc4b3d6b6c75f…

MALICIOUS

PDF

51.3 KB Created: 2020-09-06 08:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3932193f15c3066e71bb4d91c1b904d4 SHA-1: af0193cd805ef3d64d83069656f99f34c775b260 SHA-256: 663fc4b3d6b6c75fd0e4d74ac8c94ad665193f4fe3bdab4164f511a7af724b21
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, specifically designed to lure users with a "Cash App" offer. The document body, though heavily obfuscated, contains text referencing "Cash app ios 10 required android" and a URL that aligns with the malicious redirector heuristic. The presence of numerous external PDF links also suggests a link farm, a common tactic for distributing malicious content.

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/pify?keyword=cash+app+ios+10+required+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9117e0_a837be5ec6714176ac01183602ce2cc1.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_4101f4ca1d6c42fe86232d715534e9ca.pdf
    • https://static.usrfiles.com/ugd/e8e253_d3a92186cc61494e96311914c839439f.pdf
    • https://static.usrfiles.com/ugd/7182f3_2318669557fe4d2ca2bc6d288873fa49.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a3294d0fdd43828a85bcd1b00c5cf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c30d21a8b8c4586b5e78b68638c2b08.pdf
    • https://static.usrfiles.com/ugd/685707_771d2da27d8848d1b6a556508ae7a7cc.pdf
    • https://static.usrfiles.com/ugd/e745be_534d22455af24a019617d24c0a50aa13.pdf
    • https://static.usrfiles.com/ugd/2f07a1_fde704cb0cd44cd0a18e9ba5a1643785.pdf
    • https://static.usrfiles.com/ugd/9aab09_37e6b5bb112c49caae33abc54fc20c0e.pdf
    • https://static.usrfiles.com/ugd/5ecadc_b49bc9f6de3143cb94abb9ac828fb68f.pdf
    • https://static.usrfiles.com/ugd/c75f60_bec9127b58454e50a464243ee48cc840.pdf
    • https://static.usrfiles.com/ugd/9a242c_d99eb100411d4d839b312104cefaf835.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_off00008b40.bin
cfe7ee5e98fb34a641591c31b8d4193c5e2edee6a26d499d391536d0007c9b92
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 5240 bytes
font_01_sfnt_off00009d03.bin
bdc518f06e1dc55176e07bd0fbbc796933c50200c231de45206e8687aefb4536
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D03 10244 bytes