Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cd2258456597cd…

MALICIOUS

PDF

72.4 KB Created: 2020-07-25 08:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb8061c123340897ffe41209d70aa7e5 SHA-1: 8bb3a88274305d2fa1a7919363cb3c2881a85ac6 SHA-256: 13cd2258456597cd7c7974b2df394e0a7f0f93b40f3a3f27069fad9ff6deb71c
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external links, many pointing to Shopify-hosted PDFs, and a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'bcbs of illinois claims review form'. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

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.ru/pify?keyword=bcbs+of+illinois+claims+review+form
    • http://files.prima-ef.org/uploads/1/3/1/4/131406269/8b648621025.pdf
    • http://files.photosandfootnotes.com/uploads/1/3/2/6/132682204/1366480.pdf
    • http://files.cjaudiology.com/uploads/1/3/1/1/131164425/jamifimixuwix_zajoroko_lazufaba.pdf
    • http://files.barrybuilds.com/uploads/1/3/0/8/130813770/zavamomijased_puzore.pdf
    • http://files.tufproject.org/uploads/1/3/1/3/131380177/dovapefek-mamulizaxe-siziriv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/41369718939.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/kudoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/63895612305.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/dagerovidusejira.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/pagegalipefudabelunikomim.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/sezeluzimuvunemerar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lapifobojupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/sufuparoxexadumuva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/34869944210.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/kosez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/8389090425.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/19520798276.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokavurovapipemekimisam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c395.bin
16ddf0d2b1ac4b4d2f46adc4539274eab9d17c1a8a00ef3c924f3fbb8ce7e7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 4596 bytes
font_01_sfnt_off0000d3b2.bin
d0d49a073226f48a60829c90c6f80e72916e471fedaaae3a9c45f9d53f5a22b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 5076 bytes
font_02_sfnt_off0000e4d3.bin
8c088b71ebd3f26566436c8107c9f3728f155d59bec35d1b019d596ea497df50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 14664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.