Malicious PDF — malware analysis report

Static analysis result for SHA-256 c858e757666f5db3…

MALICIOUS

PDF

44.1 KB Created: 2020-07-30 06:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d48d2bd266726abedc2931a998d2135 SHA-1: 4b191c4205b9c522c471db811e578b6ac37435ac SHA-256: c858e757666f5db34d48f4f7313054c8d4d7cb2947e80d3f3c2675cd1b33b597
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.cc/pify?keyword=royal+order+of+adjectives+exercises+pdf, is a known redirector. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to distribute or host malicious content.

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=royal+order+of+adjectives+exercises+pdf
    • http://files.susandenise.net/uploads/1/3/1/4/131453674/7987559.pdf
    • http://files.recraftandrelic.com/uploads/1/3/1/8/131871462/fisukatole.pdf
    • http://files.hushupclothing.com/uploads/1/3/1/1/131164202/5522390.pdf
    • http://files.beltoneedmonton.com/uploads/1/3/0/7/130740193/f894c0536bf412.pdf
    • http://files.academyroadlanguages.org/uploads/1/3/2/6/132681337/51ca6528b6051.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/92096721931.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/21639707291.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/bovidapabalekadew.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/4940427910.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/41349234952.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/fibumuxazapiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/88805756798.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/31261837593.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/guziburuvepog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2099/files/87488637033.pdf
    • https://cdn.shopify.com/s/files/1/0429/1562/7175/files/5456752506.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/
    • https://cdn.shopify.com/s/files/1/0430/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e97.bin
c142d317e89fedae5f643cb1df44e85b97be26e0f3e48a481de697cf1c348e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 5144 bytes
font_01_sfnt_off0000804c.bin
916190f09a67e7ab83d52ca55086e774fe9bbc1d4dd4279cf08eab1db85c3e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804C 10188 bytes

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