Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbd6c369719df8c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-23 00:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4470aeb6caad4f122566948ff3eddafc SHA-1: f5c9c69667724c826913f913749d785946194ad6 SHA-256: 8fbd6c369719df8c676b8e9a9a103e3c76cccd200ef889bd45bc2d2e4f096412
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though partially corrupted, contains text related to 'Bluestacks without admin rights' and a URL that appears to be a redirector. The PDF also exhibits PDF_SEO_LINK_FARM behavior, with numerous embedded links, many hosted on Shopify, likely to obscure the malicious destination. The primary malicious IOC is the redirector URL.

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=bluestacks+without+admin+rights
    • http://sibil.epicministry.net/uploads/1/3/1/3/131383664/3469762.pdf
    • http://files.4055nelsonavenue.com/uploads/1/3/1/1/131164063/zexakonimoga.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/bufogexutezuwojasojuzid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.pdf
    • https://cdn.shopify.com/s/files/1/0433/5478/3893/files/12771538148.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/marine_geophysical_survey.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/xusugusiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9601/files/19978176664.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5911/files/gelexajeligokodexewivomem.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/29379925528.pdf
    • https://cdn.shopify.com/s/files/1/0431/3979/3050/files/synthetic_hair_color_guide.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_off0000680e.bin
ed4f3f9c7b10d7eb364ba1a8486f477e53436e5b5d3aad6f1be34ed2b24dcb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680E 5556 bytes
font_01_sfnt_off00007adc.bin
a2a051f32e707ecd39aa5007d0561a5e21cb7280cce8b84bbc9a64cefbb3edec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADC 10096 bytes

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