Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bc9a8b81c254c4…

MALICIOUS

PDF

45.1 KB Created: 2020-08-09 11:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06d87f528563c31db1bce5682b19f3e3 SHA-1: 9db1c8c6e058243a55825b174574832ebb8f5114 SHA-256: 73bc9a8b81c254c47fb87e905b3e700a95a850e3fcea2c0e099ca6a1dcc2cb2a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=spiderwick+2+pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for phishing. The document body itself is heavily obfuscated but contains the malicious URL.

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.ru/pify?keyword=spiderwick+2+pdf
    • http://files.fjcampbell.net/uploads/1/3/0/7/130739288/saxikenufuda_lijirije.pdf
    • http://felebib.msunavs.org/uploads/1/3/2/3/132303382/razifemof-getazufexamafu.pdf
    • http://files.tenor-banjo-tabs.com/uploads/1/3/0/7/130775223/sizukej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/22904543068.pdf
    • https://cdn.shopify.com/s/files/1/0439/6895/4526/files/computers_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/87349547601.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/lipejopebeseworuvekazusez.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/rifapuzujunenojusew.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4669/files/coordinating_conjunction_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/dajaboxituvupalonik.pdf
    • https://cdn.shopify.com/s/files/1/0432/6722/7811/files/86433157555.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/96033962753.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/munanejomopukebutezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/betamen.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/jegulenevobarux.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/vaxaladutibubukuluwatiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.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_off000071a0.bin
5886af347a5ff4ad6be41244207b772e149af2f6e431eaceaa93f0e938b6936b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 5120 bytes
font_01_sfnt_off00008342.bin
a55946d504819d42b1ac73118839ca83f2e998c19581872347440a3e3613eeb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8342 10608 bytes

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