Malicious PDF — malware analysis report

Static analysis result for SHA-256 a071de5e3167da5d…

MALICIOUS

PDF

39.6 KB Created: 2020-09-01 01:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e791ce3b835a4ea4b86e3fafe51648e5 SHA-1: 98c652fc119e2fa50b4ee72ef94b0fd854e8ea4e SHA-256: a071de5e3167da5df6b57187f3727af7045cfa8cb2e4b67ec327435b09723015
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, with the primary one pointing to a URL designed for SEO manipulation. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or obfuscate the malicious intent.

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.com/wix?keyword=bartender+argox++gratis
    • https://cdn.shopify.com/s/files/1/0434/5787/2039/files/bebukafirul.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/reketap.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/color_atlas_diagnostic_microbiology.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff2533c4c3f4d0db9f272b2c5c62050.pdf
    • https://static.usrfiles.com/ugd/834936_190d74d5725a4c3a8e023fb821ab2acc.pdf
    • https://static.usrfiles.com/ugd/5b5da7_2dcdca63e5a74b5884bcdf61060c92f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_16b52d1e7e444b0396e282047c1fca6e.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/ups_air_waybill_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/viraz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/pdf_file_kaise_banaye_jio_phone_me.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/74552651763.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_off000057e6.bin
2726f5b943d80f6dc7382b06cff871403c7c95a0af17eb60c0746b242d67ac4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E6 5080 bytes
font_01_sfnt_off00006941.bin
8ce5e6d064152384e0d90cd38093e4d88074f5dfa37ca4d6f5fa7da3c55ff425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6941 12600 bytes

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