Malicious PDF — malware analysis report

Static analysis result for SHA-256 5808b6ec7335d74f…

MALICIOUS

PDF

46.9 KB Created: 2020-07-28 12:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178c2f724cb3aa82183616c8ffb19479 SHA-1: b8b0151e0b061a5af03e0e5dac2920eaaf8f51d7 SHA-256: 5808b6ec7335d74fa36d12cf5781c6e71f86584d793512a329300befc74eaf7a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a significant number of embedded links, identified as a link farm. One critical heuristic indicates these links point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'full bed sheet size in inches', likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=full+bed+sheet+size+in+inches
    • http://files.chrisschnabelart.com/uploads/1/3/0/8/130873895/8094947.pdf
    • http://files.handymaninbristol.co.uk/uploads/1/3/2/7/132712323/aa1a9c418539.pdf
    • http://files.hdfsbridgetwalsh.com/uploads/1/3/0/8/130814129/2130183.pdf
    • http://files.dobbelduo.com/uploads/1/3/2/7/132712011/8b9cff5e6b1.pdf
    • http://files.rps9to5.com/uploads/1/3/0/9/130969370/6302260.pdf
    • http://files.dobbel
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80084587067.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/57005726008.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/zezufazepojeli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zinigezumapafukutogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/dulilosinazolaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/fojukukugovojumebibirerow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/39765065201.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/kurez.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/76608521038.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/fesudezezofabenogi.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_off00007c2e.bin
fdf4d1b0f512219c610025a7d70f439b316ce5d4913f688ad9a536e6548eb626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 4636 bytes
font_01_sfnt_off00008be6.bin
1c2f3b141736cf30e5edd44eac56a551cbc3ab7bf38254bea7ad05ddd7c618a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE6 9984 bytes

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