Malicious PDF — malware analysis report

Static analysis result for SHA-256 3789bb1022fad5cd…

MALICIOUS

PDF

48.9 KB Created: 2020-07-30 23:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d07920935ea6655e18c76bfdfe7302e SHA-1: c77813caec0dcb6c77761f959d19fe03c578342e SHA-256: 3789bb1022fad5cd6ab859a483f4ed5708f12e39a8f325f0a006ddeac9a6cb38
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Python arithmetic operators pdf' and mentions wkhtmltopdf, suggesting a potential lure for technical or educational content that redirects to malicious sites.

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.ru/pify?keyword=python+arithmetic+operators+pdf
    • http://files.benevit.org/uploads/1/3/1/4/131453894/e94490d4aea0.pdf
    • http://files.gateaumarche.com/uploads/1/3/0/9/130969499/5690647.pdf
    • http://files.michaelbraunlin.com/uploads/1/3/1/0/131069978/2684c3.pdf
    • http://files.commercialstreetharrogate.com/uploads/1/3/0/7/130740212/c53bff3.pdf
    • http://files.terahlynn.com/uploads/1/3/0/9/130969428/fumokagujafigu-fefewewitenemo.pdf
    • http://files.benevit.org/uploads/1/3/1/4/131453894/e94490
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/49542632192.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/falafebilufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/44202382110.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/70185420040.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6393/files/93787777833.pdf
    • https://cdn.shopify.com/s/files/1/0435/0712/2342/files/limemivogojufimixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/17177010996.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/muxobivobovutezoriwatum.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/94426282519.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_off00007667.bin
ef8734d8adfaf73a92ca6b92f8d3a7d75b08bf0f0cc9ad18c5bf2e848fcf7f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7667 5256 bytes
font_01_sfnt_off0000880d.bin
f216ae4d4cf2779525732157fa2a05a6a7d272de92f9b5fe78281b0889b86204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880D 14980 bytes

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