Malicious PDF — malware analysis report

Static analysis result for SHA-256 9523f4715c613d75…

MALICIOUS

PDF

93.4 KB Created: 2020-08-04 07:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d405328c3de94896a869558a0a094a49 SHA-1: 28d91bdfe9a58f93484d373e0e51fa55dd396a9a SHA-256: 9523f4715c613d751ab7a51f945fd008b71daf63221ce7ac14fec64b919de8fa
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in SEO poisoning or to create link farms. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=rig+veda+in+tamil+translation+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure.

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=rig+veda+in+tamil+translation+pdf
    • http://zoguj.smalltalk-maadi.com/uploads/1/3/1/3/131384284/8711a8f.pdf
    • http://files.cupsncakesbymonica.com/uploads/1/3/2/6/132683328/345887258.pdf
    • http://files.in2improv.org/uploads/1/3/0/9/130969910/kojuwodela.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/noxijunarefajuliw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9119/files/muwosikufole.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/66411024661.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/zulafipivewone.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/23153363149.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/buxolazikowuvuvuwuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/rarax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/ricketts_cephalometric_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/vasulujit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8149/7766/files/sovinudalajorax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/32313443626.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/xageb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4125/9671/files/53382282731.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/vigoroxulamazuxiwurimo.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_off000131f0.bin
3209237e74e1f6d540f6da034e7c314c87121eabe7ff48ed5d02bd19adaacce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 5428 bytes
font_01_sfnt_off0001445f.bin
935410ec5c63655671e0895bb40a5754c2fa73b63e5d5684073237d7e88cc42d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1445F 10488 bytes

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