Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f6f23cf03be4b…

MALICIOUS

PDF

36.6 KB Created: 2020-08-01 21:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d882cdf50cfb5decfa8f2a2d5e00f3ec SHA-1: 79d13c4808a37096db606f48cb30816848db5876 SHA-256: 0c6f6f23cf03be4bcfb8e49c94e3cf307577f19dd0418d495bb124afa52f5a29
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=baseball+sound+effects'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed 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.com/pify?keyword=baseball+sound+effects
    • http://files.africaep.org/uploads/1/3/1/3/131383657/tubuzuv-bomanutik-zeziroguxowo.pdf
    • http://files.bneideffer.net/uploads/1/3/2/6/132695582/845251.pdf
    • http://files.rocoveryfitness.net/uploads/1/3/0/7/130739715/buzag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/10530879778.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/mijikavupafokutigugituj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/81389970572.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/public_finance_harvey_rosen.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/64922462933.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/dokagozamatepitegiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2443/9704/files/30058883123.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/38666035238.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/36513510022.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/monusobunafak.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/sudaderoru.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/divisekofatad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045e1.bin
475c8217c765b0858d0dc5e374e610d36c511649c6f2bc289cbbc144e31805e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45E1 3852 bytes
font_01_sfnt_off00005236.bin
04754172a2ba89103c7e9295fb769caa25bf6420b98b112f63a0dccae2f59a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5236 5108 bytes
font_02_sfnt_off000063a6.bin
fd7b7835b5f5b483e6c569cf74158a384b668b081ee9732c1d326e1128a39ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A6 9856 bytes

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