Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3353315dcca03b8…

MALICIOUS

PDF

36.9 KB Created: 2020-08-10 13:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1248a4733e1f7a716f5f5d103cd409 SHA-1: e5e171cd8218769f98856369a966e0b324438b74 SHA-256: e3353315dcca03b8af80b95412110af50174e6fcc1d1a3d84f9f428ce8230103
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'biw design interview questions pdf'. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=biw+design+interview+questions+pdf
    • http://files.home-space.co.uk/uploads/1/3/1/4/131409508/bebuxotuk.pdf
    • http://baduvep.neiljohannsenart.com/uploads/1/3/0/9/130969332/xapubumikofites_vanadezo_sakejatapes.pdf
    • http://files.rockysrockets.org/uploads/1/3/1/0/131070688/3eeafad7fc658a.pdf
    • http://tapumoda.kinneycountygcd.org/uploads/1/3/0/8/130874493/4ce97.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99781003244.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/mibarosad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/ripowemigino.pdf
    • https://cdn.shopify.com/s/files/1/0440/5559/3110/files/ligise.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/soxafozowix.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/pokezajulipunuji.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/50017099215.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/60874623568.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/zuruwanolafure.pdf
    • https://cdn.shopify.com/s/files/1/0432/9829/1870/files/11207261638.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/85623231604.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_off00004fce.bin
b1641cced04abedb0cae73721052051182709c30f0baa6f2162e153b712b5c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCE 5292 bytes
font_01_sfnt_off000061f4.bin
2c51344363d6e6440f2d3d126d8ea8da04017a0da55ec3316d5c3178e544a87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 10880 bytes

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