Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fee6efde58f1b6…

MALICIOUS

PDF

37.9 KB Created: 2020-08-07 15:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c73827fa2869ad425d43e092e771bc SHA-1: 1d72251868695aba52e5cc80a2a992e21bc49f8c SHA-256: f3fee6efde58f1b6a8a83c5f02a93a4ed10efb9180c0afb0770c9d4bd7509857
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL, https://ttraff.cc/pify?keyword=aws+certified+solutions+architect+blueprint.+pdf, is designed to lure users by impersonating a document related to AWS certification. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=aws+certified+solutions+architect+blueprint.+pdf
    • http://volaf.thelaptopblogger.com/uploads/1/3/0/7/130775734/2933201.pdf
    • http://files.firstlutheranricelake.com/uploads/1/3/1/1/131164456/susod.pdf
    • http://files.ericscottsutherland.com/uploads/1/3/0/7/130738722/rexomedikomuv_kukemeku.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9018/files/24856252503.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/56813244171.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/62964714257.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/t._i._paperwork.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/xaseketamekixusupawuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/surah_yaseen_in_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0443/8815/5558/files/ectomorph_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/83709320750.pdf
    • https://cdn.shopify.com/s/files/1/0439/6895/4526/files/rabefuroderuxabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/fijisos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/76708158472.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005548.bin
ca4545e2cacc2470b288d28dcfcd079f88c957eb51b1567be7562f817b1e4883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5548 5496 bytes
font_01_sfnt_off00006808.bin
ebb87958f752a3a5069a25b921ebb55a3db57dc6fb829d82598aed02736e2717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 10048 bytes

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