Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b1ed5899129ee6…

MALICIOUS

PDF

45.7 KB Created: 2020-07-29 14:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 239fb9fccdb9b70469f5f4b5373727b5 SHA-1: 317a02b81ef14be1f3ab8056334405895fe237d7 SHA-256: 63b1ed5899129ee6ea2663c0bed4736c055a9f6e3ca058b19375cf7e43680ad6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic indicating it redirects to malicious infrastructure, specifically a URL designed to host a link farm. The document body, though heavily obfuscated, suggests a lure related to 'amend pdf free'. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm tactic. While no scripts were explicitly extracted, the nature of the redirection and link farm suggests an attempt to lead users to malicious content or further compromise.

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=amend+pdf+free
    • http://files.artistkevinbowers.com/uploads/1/3/0/8/130813888/1777473.pdf
    • http://files.sheevzphotography.com/uploads/1/3/0/7/130739385/539424.pdf
    • http://files.mauipopwarner.com/uploads/1/3/2/6/132695365/lotitim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/gidupitibudafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/jobitizopapipuwajus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/sulurevanedanov.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/12222909625.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/gomepisilipatefalesipegon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/50941048911.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/66106696797.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/sudojamuvone.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/27993791397.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/35369041738.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/wajulolivalajorefevipewas.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/fubexesarejil.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/tilad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007976.bin
e71f4394e9b895452320b5974d29200fd4313ee1ab4a51922fa5678037c7ba2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7976 4308 bytes
font_01_sfnt_off000087d6.bin
7277d788fccb5bfe8b2856873a689d2011369abd672e66a74ae952eb938cdf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D6 9972 bytes

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