Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b8fc23fa686f53…

MALICIOUS

PDF

47.5 KB Created: 2020-08-04 18:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef791e0b809922023a09e3e0e10ea29 SHA-1: b986f0cecad5e711801f360c61cc398cac7dbc6c SHA-256: c4b8fc23fa686f536b3191a5afde72889c6042989f7a48cd77af4d68e5000c37
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high density of embedded links, with a critical heuristic firing for a malicious redirector. The primary URL, https://ttraff.cc/pify?keyword=python+graphical+user+interface+pdf, is likely used to obscure the ultimate destination of the malicious payload. The document body itself is heavily obfuscated, but the presence of numerous links, including those pointing to Shopify domains, suggests a link farm or phishing lure designed to lead users to malicious content.

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=python+graphical+user+interface+pdf
    • http://gomubap.ranchosandiegopopwarner.com/uploads/1/3/1/8/131856919/5015667.pdf
    • http://files.homestyleargyll.co.uk/uploads/1/3/2/6/132682076/xubunu-wepager.pdf
    • http://files.wanderlustintheworks.com/uploads/1/3/0/7/130776445/virutotoviru_xenosuxevem_bexuvemux.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/58405635822.pdf
    • https://cdn.shopify.com/s/files/1/0432/9842/2934/files/57815422074.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/gedosabevipanavukagenoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/72517938460.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/22177748647.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/pulipalivezenajiwepudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/felosebikize.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/wirib.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9647/files/62020052463.pdf
    • https://cdn.shopify.com/s/files/1/0436/5074/4478/files/9107081903.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/46874693526.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c3d.bin
37522378d169775e835116b3db19a96685ef98c1b34e04c4bde6d4c49d882081
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3D 5520 bytes
font_01_sfnt_off00008f06.bin
9f89b54d20db2b2e4a751a58e6841f82295f3b9fbbee28223fb5c7089b210338
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F06 10020 bytes