Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4656f231a2f9892…

MALICIOUS

PDF

43.5 KB Created: 2020-07-24 15:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b100a2a717bb00db35fe5c6b50dea7f3 SHA-1: 98e07c3dd433ec0336ac9c7a95f41cbe37fe8e95 SHA-256: b4656f231a2f9892896e59fc006bb2cdc5acec7cb290aeed67cd73f4e3ef64a4
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to attract traffic. The ML classifier strongly supports the malicious nature of this PDF. The primary lure appears to be 'Libertango free sheet music', directing users to a redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=libertango+free+sheet+music
    • http://files.rtsbowlingstore.com/uploads/1/3/0/7/130775490/526c10ad477b.pdf
    • http://files.diguptheyard.com/uploads/1/3/2/6/132683168/wugabap_sarat_batuwojaluzimi_jovaj.pdf
    • http://files.holisticwisdomandwellness.com/uploads/1/3/2/6/132682093/63c7301eed7f.pdf
    • http://files.childrenscoalition.org/uploads/1/3/1/4/131452942/8212627.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/wusujaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/69648230704.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/48030774634.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/zebemigaditukasobo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/59610750500.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/20392139508.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/danukodigademekiju.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/darab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/50085042103.pdf
    • https://cdn.shopify.com/s/files/1/0432/0840/9250/files/lasunizitemisasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/1328121900.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/
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/zebem

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fea.bin
a2fcca82cade92906b594d96054baa90dd084aaf6d028eb6204fc0838565b34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 5228 bytes
font_01_sfnt_off00007182.bin
a66cb03493a43269abcdbcc18023b521c930e98b91e8a6956b7ed60d1405eec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7182 15412 bytes

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