Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bfe2e7c74c789f…

MALICIOUS

PDF

48.5 KB Created: 2020-08-24 01:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959df1836f2ede0c04a4f9a07d4714d0 SHA-1: 39c66f2dd7e7ab38ae981d18895c08a21a43e1a3 SHA-256: 66bfe2e7c74c789fa2e7d39d0f535f443da425c1907403bf918f9bac84aeca24
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links redirects to a known malicious redirector infrastructure, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'affidavit of support form 134 instructions', likely a lure to encourage clicks on the embedded links.

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/pify?keyword=affidavit+of+support+form+134+instructions
    • http://files.beattyacupuncture.com/uploads/1/3/1/3/131380771/gixobokuturen_ketagemujiwijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/juded.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/28308832457.pdf
    • https://cdn.shopify.com/s/files/1/0429/3125/7510/files/all_information_about_cricket_in.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/compressing_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/2856/8471/files/ponapadotiwim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/43018104597.pdf
    • https://cdn.shopify.com/s/files/1/0433/9410/5509/files/balanced_scorecard_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/fuzoririk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/lupido.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/buposa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/56667380924.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/85239606457.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_off00007dc9.bin
2dd4e5669af28c37a02894daca5ccf4a668d0f0d82ea7c617a81a9799cdecbc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC9 5624 bytes
font_01_sfnt_off000090e2.bin
4835d95523ba7cd4979c358da0e29642267a3f1500452f13119bc689f6dda843
pdf-font-stream PDF embedded font (sfnt) at offset 0x90E2 10588 bytes