Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ad98d36658a803…

MALICIOUS

PDF

43.6 KB Created: 2020-09-02 18:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f701396dff02bb169e40c00e7bc1ecf8 SHA-1: 9e5d9cb5147573d1aa03bbd5e4064c4f2d364dc5 SHA-256: 81ad98d36658a8037dc0b556bc799061769c8620062e58059d94740dc88ffd49
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous PDF documents hosted on Shopify, with one specific URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking PDF links. This suggests an attempt to manipulate search engine results or to redirect users to 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.me/wix?keyword=angular+formcontrol+date+value
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/2248499.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/dell_poweredge_r730xd_spec_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/viraxeres.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/redufunelikivovobiboxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/kinirenujem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/94877776486.pdf
    • https://static.usrfiles.com/ugd/576447_3cdd55b7dba14767ba96be636bd12bfe.pdf
    • https://static.usrfiles.com/ugd/5b604d_662d826d8f7948afa36cb4d34d6c7600.pdf
    • https://static.usrfiles.com/ugd/0d9a50_f420bac8080d4056a99b572be828305c.pdf
    • https://static.usrfiles.com/ugd/2074c9_9ccd6712888649d2bded73e2dbc2308d.pdf
    • https://static.usrfiles.com/ugd/e745be_bca57b9f76ea451cbf8652fd30710984.pdf
    • https://static.usrfiles.com/ugd/b8c837_79e5621b3b93465c933d78aa27bd31cc.pdf
    • https://static.usrfiles.com/ugd/f967ac_7c8741b1e88c41ce98587da85c30e8dd.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_off00005d75.bin
1161780d90df0e5ea511bc1e88364db3232ffc8836b12020fc3b590a76437c0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D75 5212 bytes
font_01_sfnt_off00006f25.bin
505af2660587faf85511e0ca70115a1af4d09584da0064407421c6a96573bd95
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F25 16084 bytes