Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c31138f3fbb2463…

MALICIOUS

PDF

42.5 KB Created: 2020-07-31 12:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a80f8983679076732b0fd48f9bd3f8d SHA-1: 5d8d1d8a5d9988e59c5b7a0cb532661378d5bc6e SHA-256: 0c31138f3fbb246334fec20b64093b5ed17e14d366a6359f7c249239807eeafa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. These links ultimately redirect to a malicious URL (ttraff.cc), indicating a phishing or redirection attack. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.cc/pify?keyword=physics+today+november+2020+pdf
    • http://files.ceoyear.com/uploads/1/3/1/3/131382141/f249b98b8.pdf
    • http://files.kissre.com/uploads/1/3/1/4/131438161/65581792161.pdf
    • http://files.thecanvasofmylife.com/uploads/1/3/1/6/131637242/noturaxipekekan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/89546830529.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/17655834448.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/58806746011.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/kefirutipoxisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/duzedekilotedizuvoze.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/27768912894.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/jevasemuwizukuminale.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/99481834791.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/wokusamafuvafexajasuzara.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/23778762390.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_off0000678a.bin
f828f6040c0502b25490bdcde4323ed19cf99be5e1a37fb575782f85d257a934
pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 5728 bytes
font_01_sfnt_off00007ac9.bin
10f4fd6bb5a5ffda02530a2bb46d8b3d3c80b53dd2e4660236ec22ba3fcccd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC9 10140 bytes