Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2a4540ac24f793…

MALICIOUS

PDF

64.7 KB Created: 2020-08-03 23:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d176628a351a3c165f6ece57ca9f8e SHA-1: 7125a9084abca286b88edb8b63a3649057ab33c6 SHA-256: 5e2a4540ac24f793620e7224d234c1295a5224f92b2072554d745bdc4a5d80a7
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 pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO spam operation. The primary URL, 'https://ttraff.com/pify?keyword=biological+science+freeman+7th+edition+pdf+reddit', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be designed to mimic search results for a specific book, indicating a lure for users seeking content. No scripts were extracted, but the PDF structure and embedded links strongly suggest malicious intent.

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=biological+science+freeman+7th+edition+pdf+reddit
    • http://files.sincerusgroup.com/uploads/1/3/1/4/131483445/1347965.pdf
    • http://files.websteradventure.org/uploads/1/3/1/0/131071164/8cb2a52a5e2346.pdf
    • http://files.adimef.com/uploads/1/3/1/4/131437123/sewexazurobada_litatu_zotowofefu_puvifapik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/zokig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6414/files/53904599788.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0319/files/basopakitirax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6025/7177/files/30646448720.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/39758498222.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/70608197000.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/i2_analyst_notebook_export_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/17321953595.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/64983423924.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5331/files/riwolubuniwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/transformar_em_word_candy.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/59727811892.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_off0000bbbf.bin
7f8c30156713e40fea969abe0d6cf59903bb28f487b6555d9e6afc903783e5fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBF 5700 bytes
font_01_sfnt_off0000cf05.bin
531a0def37394acf2236f4fb0c4e477fe22fd20ae0feee94515e9a441dedd927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 11372 bytes

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