Malicious PDF — malware analysis report

Static analysis result for SHA-256 563c7b0590c9a479…

MALICIOUS

PDF

38.4 KB Created: 2020-08-24 14:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3251e75f6d86e5a6c50b176897adf57d SHA-1: 0a5e0641c18b65c3e2f815ad389be75b53338e0e SHA-256: 563c7b0590c9a479061a7f3f2ceb3623a509a259966579cde34de9ba2313a9cd
152 Risk Score

Malware Insights

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

The PDF contains a high number of external links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=coliform+test+results', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites. 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.cc/pify?keyword=coliform+test+results
    • http://mijebagup.imyourinsurancelady.com/uploads/1/3/0/8/130814124/rexovawipezuxikeje.pdf
    • https://cdn.shopify.com/s/files/1/0428/8525/1235/files/33770921993.pdf
    • https://cdn.shopify.com/s/files/1/0460/2750/5823/files/multiplying_and_dividing_decimals_word_problems_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/49453004157.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2527/files/dilaberukomolapagefuzodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/dakowofipobun.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/spiderman_specs_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/valores_eticos_y_morales.pdf
    • https://cdn.shopify.com/s/files/1/0437/9086/0437/files/16572201853.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_off00005b2d.bin
aa4f59dc5f6c03791bccdfda13836231349296dd671e14cfb13f98b8c1c5638b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2D 4608 bytes
font_01_sfnt_off00006aba.bin
a3cd44c4923116b75390dfd78935d35f6170c226ce082b6c382015e1f82f27fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABA 10208 bytes

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