Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd2571f5701019e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 10:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1f172c838137247e561ff1c46f95110 SHA-1: e01f5074e09b054b9c39e44879f2793b4bec5f5e SHA-256: 1cd2571f5701019e8de8c82a9ef83330ec47405d17d019ac456a1f618198427e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This URL is presented in the document body, disguised with a keyword related to a 'nescafe barista machine manual'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains hosting other PDFs. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for a further attack. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=nescafe%20barista%20machine%20manual
    • http://lufil.camasnazarene.org/uploads/1/3/1/6/131607095/nunibaxe_vamefaj.pdf
    • http://files.playtherapyworks.com/uploads/1/3/0/7/130775503/xogixo.pdf
    • http://files.rowanwritingcenter.com/uploads/1/3/0/7/130740514/bobaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/the_economist_style_guide_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/67248651991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/nitexunurivizabuniti.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5721/files/43607775984.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/enter_the_gungeon_crutch.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/83174582180.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/fosariwipukuferiso.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_off00005b95.bin
ee09117391f49d4075c399624392f251d2ee93edf67decab947b614daa51c4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B95 5000 bytes
font_01_sfnt_off00006c66.bin
930f658623b9147b12e98107606535d0b744819658d02af0a47ff293bd061340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 9876 bytes
font_02_sfnt_off00008e32.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 4324 bytes

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