Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfe3c30d3d933d…

MALICIOUS

PDF

62.7 KB Created: 2020-08-04 16:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb081fd1c44c0f741add3e7b3823df2 SHA-1: d275f9d9dc420a869d6fa9630e526ca6ac8d4302 SHA-256: 50cfe3c30d3d933d0472f660b4d54ba8a4aac3c8f2ffc72f4f8548c91ffc4bfa
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirect. The primary intent appears to be to redirect the user to malicious infrastructure via a deceptive lure.

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=espejos+eduardo+galeano+pdf+gratis
    • http://gulom.spicerorchards.com/uploads/1/3/1/0/131069899/58a8440e143e9.pdf
    • http://files.pokatronic.com/uploads/1/3/1/3/131379991/a319948d5303.pdf
    • http://vilazomub.nancyleeharper.com/uploads/1/3/2/8/132816202/7681265.pdf
    • http://files.pokatronic.com/uploads/1/3/1/3/131379991/a
    • https://cdn.shopify.com/s/files/1/0431/6807/1836/files/marekume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/naduz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/8938422475.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/pomemoxetapuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3157/files/poxajofa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/ballade_pour_adeline_klaviernoten.pdf
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/5232702375.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/wetotixebifotuvoxox.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/nenamuxikolofipijuzevud.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8787/files/sonicare_rebate_2017.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/lifugasanabujo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4637/8404/files/40866736556.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_off0000b3a4.bin
f4ae03242309a2a6e8d4ea940a5b88d0c83ba0b357d95efc54425ad53bd93162
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A4 5240 bytes
font_01_sfnt_off0000c590.bin
f2a7b32f7fa5cd363d553f7d4fa46f19c1b0316b3e624ccebb91294f9532da08
pdf-font-stream PDF embedded font (sfnt) at offset 0xC590 11760 bytes