Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f93027f7281292…

MALICIOUS

PDF

37.1 KB Created: 2020-08-29 07:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8767f3275dd9b3ceaec7852bad98d4d1 SHA-1: 0ecf9404c0f4158aaedd3904abedaa29bf746714 SHA-256: 88f93027f72812925b61cf170c3c6b4551c065f378ddc854540eaac41f5f00d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but the primary link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. 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.com/wix?keyword=sap+netweaver+bw+7.3+-+practical+gui
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/fenuwamutopufafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifezunelavezide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1956/6231/files/14789666019.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/cognos_11_active_reports_tutorial.pdf
    • https://static.usrfiles.com/ugd/b8c837_187e6a07cd594147978832de4c0a387d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dadca1a3511476bbd9011da8b4af329.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffe18ebf45f244ad9de6b3ea605aeb29.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8813a76683e41758b0793fc6c1a0021.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/free_html_template_homepage.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/11985167649.pdf
    • https://cdn.shopify.com/s/files/1/0463/0917/9554/files/december_1963_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0461/1457/0404/files/19901358526.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_off000051e4.bin
dfe8b45c0b7f81e25f54e671e1b6c5fdf8caa0002479d85b8c2869a77bfaaab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x51E4 5624 bytes
font_01_sfnt_off0000653a.bin
712988f0da0f5ba1708ad4b1a74ab5fb5d0724d5ffa65a5a5b45c238457b01a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 10200 bytes