Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9d2048c8d2084f…

MALICIOUS

PDF

36.4 KB Created: 2020-08-02 05:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 811e5af7a3d835e21826552a64c451e3 SHA-1: afcfdee9272cbbd4538d9e4a1b0d5254fe3c7c4c SHA-256: 5a9d2048c8d2084f13c1063cbe300d6e5ec6bf79d5f4e34de2c6dc4b9b1ff836
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary links, 'https://ttraff.ru/pify?keyword=hotel+vendome+towels', is flagged as malicious. The document body, though heavily obfuscated, contains this URL and other links to external PDFs, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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=hotel+vendome+towels
    • http://files.scallowaymuseum.org/uploads/1/3/1/3/131379042/nigij.pdf
    • http://files.theanatomistfix.com/uploads/1/3/1/4/131438899/zoziwisosivadivojeg.pdf
    • http://files.hayonpark.com/uploads/1/3/0/7/130740513/a21f543e29d4fe.pdf
    • http://files.thesbkshop.com/uploads/1/3/0/7/130775698/8450251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/us_stock_market_holiday_2016.pdf
    • https://cdn.shopify.com/s/files/1/0436/4078/3008/files/mutuwozupagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/jibuxifasiwiwek.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/34688828586.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/4741216720.pdf
    • https://cdn.shopify.com/s/files/1/0430/0986/7929/files/62515425366.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/69420246052.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/72129709553.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/veraluxiwowekidujiwamis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/namujos.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/26213681137.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/37960082940.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/relinebidexoganakimepil.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_off00004f4e.bin
5723652f70b01158453f46afcaa1723044c6ba351d481a1c3c405a26a91c1ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4E 4780 bytes
font_01_sfnt_off00005f8e.bin
def2071d4896938cb05a7345a368db3713ff749b1440d1ad4e217a6843392830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 10976 bytes

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