Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d4022d2d53739a…

MALICIOUS

PDF

42.9 KB Created: 2020-08-02 13:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dbd9970fc957e60bd4e04efb46488ab SHA-1: 24aaa7cee6e4299aa5e2dad18c3671dc987669f0 SHA-256: 11d4022d2d53739a823083a51c0b174c67066a98ec1c31c0508c0e4b38f9ffdb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One prominent URL, "https://ttraff.com/pify?keyword=windows+server+2008+keys", is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports the classification of a malicious redirector.

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.com/pify?keyword=windows+server+2008+keys
    • http://files.emilyrobards.com/uploads/1/3/1/6/131606631/nuluteduramose_lataxasatimapa_tibejazadome_pavevu.pdf
    • http://files.sevahealingarts.com/uploads/1/3/0/7/130776255/nelipipe.pdf
    • http://files.elohimhouse.net/uploads/1/3/1/4/131437859/wezus_kewukunolo_bagejoligezej.pdf
    • http://files.sabrinashandbags.com/uploads/1/3/1/6/131606486/3acda07b6ebfa09.pdf
    • http://files.aimeehillmassageyoga.co.uk/uploads/1/3/0/7/130738701/001457ae44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/18156717353.pdf
    • https://cdn.shopify.com/s/files/1/0432/7397/8011/files/82706111650.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/katenorogetefoxixivuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4519/files/vozelukarawuzilatenanekeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/kidasat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/94258903795.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/459274144.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/zedajom.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/leisure_bay_hot_tub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/dalek_mod_discord.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.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_off000069ef.bin
efeaa900f6d431468ef7eba176d7b7a721ab91b0aed00a50d50bf376c11365cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EF 5376 bytes
font_01_sfnt_off00007c76.bin
a7d1e0bac0a603f08051de38b9d6a1d6acfa42b4252b5a2ca7d7be7793d20aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C76 10248 bytes

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