Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb82aa94b643d3fb…

MALICIOUS

PDF

50.3 KB Created: 2020-07-10 07:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 66760be717c55dc39bf7cce780e2a6b4 SHA-1: 2cc1e14aa475ee505df8a09dfafeebfc77df4542 SHA-256: eb82aa94b643d3fbb2657918b174e91dc5351941181d7948c23fac99d7fd1138
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF file contains numerous embedded links designed to redirect users to various external sites, forming a link farm. One critical heuristic identified a direct link to known malicious redirector infrastructure at https://ttraff.com/wb. The document body, though partially corrupted, also contains this URL and others that are part of the link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=autumn%20leaves%20jazz%20chords%20pdf In PDF document text
    • http://files.richardcozicar.com/uploads/1/3/1/3/131383823/metegebud_xatikeg.pdfIn PDF document text
    • http://files.floridakeysoceangallery.com/uploads/1/3/0/9/130970014/jumepopem.pdfIn PDF document text
    • http://files.nphsjrwolfpack.com/uploads/1/3/1/4/131483253/pageponiputi_gosalobire_vopepas_fatibo.pdfIn PDF document text
    • http://files.silverisgoldgirl.com/uploads/1/3/1/8/131856358/pidevago_kisasasag_luxojomodebi_bupifekireja.pdfIn PDF document text
    • http://files.sillassenhalf.com/uploads/1/3/0/9/130969555/bevijidu.pdfIn PDF document text
    • http://files.stutteringsource.com/uploads/1/3/1/1/131164419/ae48ae31d9.pdfIn PDF document text
    • http://files.huronsaugagolf.com/uploads/1/3/1/3/131384468/wisolijuxifikikorefi.pdfIn PDF document text
    • http://files.neebz.net/uploads/1/3/2/6/132681767/4264c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://waguxuxofino.files.wordpress.com/2020/07/87583065894.pdfIn PDF document text
    • https://zezupid.files.wordpress.com/2020/07/lokuz.pdfIn PDF document text
    • https://siladeketo.files.wordpress.com/2020/06/fenewarexojimizotil.pdfIn PDF document text
    • https://nixalomitu.files.wordpress.com/2020/06/kejojuwobefe.pdfIn PDF document text
    • https://rogofifadek.files.wordpress.com/2020/07/94532475841.pdfIn PDF document text
    • https://burelixub.files.wordpress.com/2020/07/ribaju.pdfIn PDF document text
    • https://bowamupodi.files.wordpress.com/2020/07/58312813628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77603652905.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 5404 bytes
SHA-256: 218f4a0471e69b83ffe588d1e47e6f2000c725401063ad1eb56d4ee78b97caa7
font_01_sfnt_off00008cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFE 3020 bytes
SHA-256: 2e9891ae6d5c222eec60b12a73b81bb69387537a489f5d9aca74c65d99ffaf7f
font_02_sfnt_off0000993a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993A 10076 bytes
SHA-256: e5b43b052900a1298e7392133a2af002db6d63b9cfd88c1cc659c5f9a4709104