Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b96aeb41e043ad…

MALICIOUS

PDF

43.5 KB Created: 2020-08-07 01:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de87c9ab96283c8eee2bde9ed535ac0 SHA-1: 3bb8912cae2c0145d84a341e41b35eb80420892b SHA-256: 31b96aeb41e043ad40baf524e21857593c2e4b79c9a2a3d66bcc1ba4052ff628
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a 'free economics course PDF'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The presence of a link farm heuristic further supports the malicious intent of distributing links.

Heuristics 3

  • 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.
  • 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=curso+de+economia+gratis+pdf
    • http://files.kkelleydesigns.com/uploads/1/3/0/7/130775959/c284e6b97.pdf
    • http://files.likesgoodbookslifecoaching.com/uploads/1/3/0/8/130814423/9263700.pdf
    • http://files.dumpstersandtoilets.com/uploads/1/3/1/8/131872137/xikegatudamuximavid.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/bomimelobaderexudajid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2128194791.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/49786910301.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/12192624229.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/35583442103.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/nivige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdf
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/27175111341.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/bobbi_brown_makeup_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/bigunoburufod.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/
    • https://cdn.shopify.com/s/files/1/0433/8126/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068fe.bin
6e463ce901d23acdf6f05637daf372ce473ba6468323d5e7d06762753d404a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 5348 bytes
font_01_sfnt_off00007b14.bin
4309e869513d7445c26fbe09dd01917ca949f2e22434754450ebeddceeefeb98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 11128 bytes

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