Malicious PDF — malware analysis report

Static analysis result for SHA-256 c982f2a7f86a4130…

MALICIOUS

PDF

61.9 KB Created: 2020-08-14 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb48daad0863170f26a1d7645f1cf72 SHA-1: 04d27b473042491b71518267c3d03a0f6d25af9f SHA-256: c982f2a7f86a4130b6d50ec49f48a8f2d940cd4124cea77f59b3f5459d213009
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a deceptive lure, presenting itself as an 'Employment certificate letter template' to trick users into clicking a link. This link, https://ttraff.ru/pify?keyword=employment+certificate+letter+template, is identified as a malicious redirector. The document also hosts a large number of other PDF links, suggesting a link farm for SEO manipulation or to distribute further 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=employment+certificate+letter+template
    • http://kejapujol.kirkmahoe.com/uploads/1/3/1/3/131380183/kipevexuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/61450881893.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/investec_bursary_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8084/files/duwesitasazar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/zonumuzafasuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/48470806278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0858/1019/files/canada_ukraine_free_trade_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/nemamegedexim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8412/7135/files/64016615406.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/98357910587.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/parowetuwaxiniriri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/difference_between_manual_and_automation_testing.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/wazutegom.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/vexux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab6b.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6B 2828 bytes
font_01_sfnt_off0000b566.bin
44f488deb6662cc4370ab89d26e36cf5e90e135ec54d1d8b756af24299934c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB566 5044 bytes
font_02_sfnt_off0000c681.bin
3c6544440e4b22661f6016da8e93bcbe5cee7b9d216ebd8111dca387e739ac54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 10352 bytes

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