Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b07fa1ac883b3e…

MALICIOUS

PDF

48.1 KB Created: 2020-08-22 08:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ff6d60cf325cc80cc9b1f8ea3e5f165 SHA-1: 5fe3f3204305d96f8b98f26f74368a7fb96823b1 SHA-256: 07b07fa1ac883b3e324c37170895bef31ce7465b4181f248da9b2a7e3f188908
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed to generate search engine traffic. One prominent link, https://ttraff.cc/pify?keyword=tca9548a+i2c+multiplexer+datasheet, leads to known malicious redirector infrastructure. The document body is heavily obfuscated and contains what appears to be corrupted text, but the presence of the malicious URL and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful 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=tca9548a+i2c+multiplexer+datasheet
    • http://files.idokodo.com/uploads/1/3/1/4/131437241/cb2233.pdf
    • http://jomok.1stgradespanishtrack.net/uploads/1/3/1/8/131856827/nuderifijonimidu.pdf
    • http://dizige.grandprairietreeandlandscape.com/uploads/1/3/1/6/131636948/zuwuvuxuwa_rapebuxu_saluk.pdf
    • http://files.newbornumc.org/uploads/1/3/0/9/130969985/2615501.pdf
    • http://runib.lindaoatmanhigh.com/uploads/1/3/1/6/131606457/vupid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/4040499094.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/digestive_system_diseases_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/alginate_gel_formed.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/powome.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7727/files/kejonupovijimigerawurire.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/dafikubamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/libertarianism_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/94648862789.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/lefujulefiratemofu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/junagegavizopefina.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_off00007a5f.bin
bd6b3476689f6e30213d0793415aa1840141c3b09b367c564571b7cf848c817d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 6024 bytes
font_01_sfnt_off00008ebb.bin
385d8d50befab32443c82ec9bcb69089db6e3b9bebc1908352ef89450bf6e9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBB 10636 bytes

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