Malicious PDF — malware analysis report

Static analysis result for SHA-256 663a25ea4ac8f19c…

MALICIOUS

PDF

42.8 KB Created: 2020-08-06 14:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1da334e295a86e58b18c74bcda798c SHA-1: b5d58767b36958bbcc3cf6d3bd8e3af83ae8eb1d SHA-256: 663a25ea4ac8f19c8fd57b75ff51fe0306475b3f25fd27c15840c4b5f04ffd5a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=personal+development+pdf+teachers+guide'. It also exhibits characteristics of a link farm, with numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking Shopify links, suggesting a lure to a malicious site.

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=personal+development+pdf+teachers+guide
    • http://files.worldclasslanguagesolutions.com/uploads/1/3/1/6/131606175/tesejetexilo.pdf
    • http://files.wealthynationinstitute.com/uploads/1/3/0/7/130739163/13d33.pdf
    • http://pumid.kitchens-alive.com/uploads/1/3/1/4/131454065/72cba7f300.pdf
    • http://joniv.qcfamilymartialarts.com/uploads/1/3/1/3/131378780/gowujozadepe-vawexaxoko.pdf
    • http://gidote.carlosbenson.com/uploads/1/3/0/7/130738615/2793010.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/komakasekepurupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/63672718497.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/tufoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/55203397488.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/50260013269.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/27420873194.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/95708080635.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/cessna_150_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9574/3907/files/24824344033.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/84860763629.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/vanegewinexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/15845188754.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_off0000672f.bin
22cd39fbb2b568d3bf129201b3ad2acfbb62f51bca153054df47a152ef94b113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 5632 bytes
font_01_sfnt_off00007a38.bin
2567c11f1879b954bb0e87190be455596416ab093ecdfbc2a33ad8a1f6e8c726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A38 10516 bytes

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