Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a50c4a679754d94…

MALICIOUS

PDF

47.8 KB Created: 2020-11-02 09:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9164a82d50bd58b2c27f600fa83fd79b SHA-1: 1dcf70d53c88735e133bf1ab48df1af94983b9e6 SHA-256: 4a50c4a679754d9459c5db4340fc7d2b507699b3e3af70cbf6435ec9acd8bbec
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the primary URLs, 'https://ttraff.ru/123?keyword=mophie+cases+iphone+xs', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to malicious infrastructure.

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/123?keyword=mophie+cases+iphone+xs
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f936ca57ccaf.pdf
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5f98a19840dcc.pdf
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f8e555f8a933.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f8ca3b0d3ea3.pdf
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f9f45a043a4e.pdf
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f9a6a594108a.pdf
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/siruzewabami_refovafirux.pdf
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5f9a11518d990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0493/0925/3791/files/fuxelagidododejajeg.pdf
    • https://cdn.shopify.com/s/files/1/0496/5521/8332/files/90926631838.pdf
    • https://cdn.shopify.com/s/files/1/0507/1296/9415/files/6249440295.pdf
    • https://cdn.shopify.com/s/files/1/0266/8783/2256/files/carver_county_property_tax_statement.pdf
    • https://cdn.shopify.com/s/files/1/0502/7551/6588/files/zubas.pdf
    • https://cdn.shopify.com/s/files/1/0268/8670/1238/files/mothercare_camberley_cot_bed_-_white_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0500/6308/1643/files/kangertech_evod_manual_battery_1000mah.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_off00007c71.bin
5d48ca861b31cac21e6b8af172fc6ab9b1c7030f6aa9a9b999055d1c860cdfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C71 4968 bytes
font_01_sfnt_off00008d67.bin
402a6901c2a382332a67c0a0c8ffa5468d2a979bbf4694c3ff03d1a52cf24f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D67 10792 bytes

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