Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cddf75aea0f5211…

MALICIOUS

PDF

49.0 KB Created: 2020-08-05 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1c5834327ef70cac265b8d0095fe6b SHA-1: 4f1e39e7e89462838d18a8713682f6f1aac27c8e SHA-256: 6cddf75aea0f52117af9f326615e809258ccc618dd5255c4a721b59057d17abe
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Shopify domains, suggesting a link farm or SEO spam campaign. One critical heuristic indicates a malicious redirector link, and the ML classifier strongly flagged the document as malicious. The document body, though partially garbled, contains a URL that appears to be part of the malicious redirection infrastructure.

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.cc/pify?keyword=information+system+in+banking+sector+pdf
    • http://files.chcmarketplace.com/uploads/1/3/0/7/130739826/8775886.pdf
    • http://files.ieltsteetak.com/uploads/1/3/0/7/130776826/lefamolotu.pdf
    • http://files.woodshoppe100.com/uploads/1/3/1/4/131453712/tasuzaluz.pdf
    • http://files.theverdictomaha.com/uploads/1/3/1/6/131607163/repuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/avon_brochure_september_2020_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9221/files/31048698733.pdf
    • https://cdn.shopify.com/s/files/1/0434/6649/0006/files/wumutulamufogunuli.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7835/files/73997196176.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/wifowoke.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/vafodizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9624/files/6742421310.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/tijereluje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3641/files/zimawabukizirugige.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/solimadafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0433/2525/9944/files/fiximaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644c.bin
5a06f97416bba0c864bdf747d1695b29b38eef2e67554d143ec63b6312f09ba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644C 5476 bytes
font_01_sfnt_off000076d1.bin
6c283d0f8c3a454d62a5227e1db48d66fc40b88e91e99d5ed466f8f8039fc7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D1 15196 bytes
font_02_sfnt_off0000a608.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA608 4324 bytes

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