Malicious PDF — malware analysis report

Static analysis result for SHA-256 443ee59f5657e77c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 20:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 182ac9727fe980bdb1be5d10561a6966 SHA-1: 6c333a6faeb01ed974895d77115175e19179ce7e SHA-256: 443ee59f5657e77c687aef29598425f018532ac90c476ae1ca6d88d216ada011
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to document titles that appear to be SEO-optimized lures. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=noun+phrase+and+noun+clause+pdf
    • http://files.shorewaybusiness.co.uk/uploads/1/3/2/8/132815866/66722b3c2069.pdf
    • http://laxubob.dansnowartwork.com/uploads/1/3/2/6/132695569/xegima.pdf
    • http://files.ronyafoyconnor.com/uploads/1/3/0/8/130813427/limejefed.pdf
    • http://files.morganlawpllc.com/uploads/1/3/0/7/130739802/suwojukiludinon.pdf
    • http://dagivizod.bostondigitalproductions.com/uploads/1/3/1/3/131383544/jakegazevajawerafogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/xufuvademukemu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/wenewilegu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7207/files/subtracting_dissimilar_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/11490168120.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/givuvopemeligaxabitota.pdf
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/bilirubin_pathway.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/91367871862.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/97352354067.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/keworo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3958/0575/files/18162163761.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/14636660658.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/91788190834.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_off00006d8d.bin
3f961800016229aad1f3aa602423a09dde4d7f30dde2467c398e4f2aa4877b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 5212 bytes
font_01_sfnt_off00007f43.bin
9c3fccaf7b8eccf26d18d9619f00d3fefd4a51df99e9a10373f2b09198b426f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F43 10108 bytes

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