Malicious PDF — malware analysis report

Static analysis result for SHA-256 454e427fdb40b82b…

MALICIOUS

PDF

66.3 KB Created: 2020-08-07 16:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da663568d093ba38025385676f76d75 SHA-1: a69b002a26dad6f3aae9cb007d29872f178f2664 SHA-256: 454e427fdb40b82b58095f2a8621947acf8305658e1b8c5fed528cc4cac5cac6
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Can you edit pdfs for free' and the malicious URL, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, likely to obscure the final malicious destination. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=can+you+edit+pdfs+for+free
    • http://files.bluecrimsonanime.com/uploads/1/3/1/8/131857734/9895937.pdf
    • http://files.merimbulaunitingchurch.com.au/uploads/1/3/0/7/130776511/3623876.pdf
    • http://pufewopu.bellecityvet.com/uploads/1/3/0/8/130814124/4876441.pdf
    • http://files.sjaspiritshop.com/uploads/1/3/0/8/130813732/b6120b75914d313.pdf
    • http://files.critgeoed.com/uploads/1/3/1/4/131453193/9267422.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/76333903820.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/69615198396.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/javowoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/barefaliposikor.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/66070814265.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/201648558.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/98845062846.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/81709048656.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/reranemawugawinefop.pdf
    • https://cdn.shopify.com/s/files/1/0438/0357/4434/files/bobcat_e35_specs.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/trigonometry_10th_edition_lial.pdf
    • https://cdn.shopify.com/s/files/1/0430/3886/7607/files/dogofig.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008633.bin
c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 6588 bytes
font_01_sfnt_off000096ad.bin
4f4268b249007930060acd95bd5339f19109b03c55b5836934b3d386a529f394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AD 5012 bytes
font_02_sfnt_off0000a7cf.bin
279c37fcabba51aac6d2da334e904db04caff73ea0fe0e33b42da9ccacbeb2f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CF 2144 bytes
font_03_sfnt_off0000b18e.bin
5455c188ebe424301cfe51c3ce2faafe6482eb11a5cd8b0b331432f0bba9ec49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 10968 bytes
font_04_sfnt_off0000d730.bin
5df9a924020f3b47f20d23ec22d8572383feb6ad42681b2b1a3175c3053cc5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 16132 bytes
font_05_sfnt_off0000ec26.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 4324 bytes

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