Malicious PDF — malware analysis report

Static analysis result for SHA-256 420bf2964b7dba0d…

MALICIOUS

PDF

51.8 KB Created: 2020-04-26 06:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0613e5b694bbd527db619c2118b0bdc9 SHA-1: f722898b66c5fc0f0d5bd49c49077d2a7a7a8e97 SHA-256: 420bf2964b7dba0d410a968d6630ab4e0b3dc10c2c361a5f424136fb2450d64a
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on unrelated domains. This behavior is indicative of a link farm or traffic generation scheme, potentially used to boost search engine rankings or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://photosbypi.com/uploads/1/3/1/0/131069863/131069863.html#warframe+helminth+charger+guide
    • http://bestofliferoofs.com/uploads/1/3/1/4/131438193/nowiwonon_nupidik_lisobolonom.pdf
    • http://w2propertymgmt.com/uploads/1/3/0/8/130814926/103718.pdf
    • http://discoveryresourcesllc.net/uploads/1/3/0/4/130494172/lokipipeti.pdf
    • http://drqchiro.com/uploads/1/3/0/4/130483875/difibitajujama.pdf
    • http://rjchildrenministries.com/uploads/1/3/0/6/130604288/gozisax_lixefejefeda_lisinekefoja_kegake.pdf
    • http://drqchiro.com/uploads/1/3/0/4/130483875/difibitajujama
    • 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_off00008c74.bin
ab9e1d97c1b4d5fa98d3ad9bd8a44ac3719b2988a772941425f368ee4ab0e0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C74 8908 bytes
font_01_sfnt_off0000ae56.bin
de9ab7d3f801febf349f8627b7aa0c20fcf05f39190c656d73ff63bae9e1d702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE56 16040 bytes

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