Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6fb6d82ae5a8f0…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 18:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f056f673c1db7814ae44c8e393a9148d SHA-1: 4da02697a9a34a0309d7808eea37b81653bb2937 SHA-256: 6a6fb6d82ae5a8f0364f6de08a903bba13388599b66fdf35337e0f21bf4b1f43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-building or distribution scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely related to distributing or linking to other 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.ru/pify?keyword=different+types+of+electrical+cable+pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://files.greatlakesantiquesandartisans.com/uploads/1/3/1/0/131069978/a494c7fb1.pdf
    • http://files.lovelivv.com/uploads/1/3/1/0/131070866/kijupisutebox-rodidofugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/fixirer.pdf
    • https://cdn.shopify.com/s/files/1/0433/7097/1299/files/81184187260.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/gejajijevuku.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/96808575723.pdf
    • https://cdn.shopify.com/s/files/1/0446/6864/9625/files/lightning_arrester_types.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/58894519355.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/36644622982.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/36726731934.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/390350778.pdf
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/fanigupowox.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/83307267908.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_off00006642.bin
1de799ba5457d8c37a7440d8e610e3699c77bf96027bbe9e00d6b40bd9ae77b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6642 5392 bytes
font_01_sfnt_off000078a6.bin
e363967d91bc0eddc796a52b3cd8cdd7acbaf5551ee66cde62a5f2d8204ce4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x78A6 10160 bytes