Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d405568b707be1f…

MALICIOUS

PDF

71.5 KB Created: 2020-08-24 05:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29f43fe01259fea5622f3b22babc7b8 SHA-1: dd111b5549e33a10375b2ccf7260fa7e7be3fe2a SHA-256: 3d405568b707be1f39cf67276010a5bddcc2e6337924b25a544ae1efbc7b40fe
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'plasma membrane and cell transport pdf'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site. The PDF structure and link farm suggest a phishing or spam campaign.

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.ru/pify?keyword=plasma+membrane+and+cell+transport+pdf
    • http://pofadiva.jwhitneyart.com/uploads/1/3/0/7/130775565/2726583.pdf
    • http://files.samuelpriven.com/uploads/1/3/1/4/131437676/7214059.pdf
    • http://files.brandywinevalleyquilters.org/uploads/1/3/1/4/131438353/pufekamukopus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/double_digit_multiplication_worksheets_with_grids.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/8787485960.pdf
    • https://cdn.shopify.com/s/files/1/0439/2363/6379/files/43076332094.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/rekukesuleluzalebakulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/43655384448.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/69918034460.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/32649725222.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/sarubemoxevena.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/lasewalurotakiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/sample_business_report_format.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_off0000dbd3.bin
436ad58e27341d9b09a3fc43d0d3ab7e066ed76238bb41b8bbbbb58c2e35330c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 5444 bytes
font_01_sfnt_off0000ee2a.bin
92ccc6291191b9967a431f0760b3852e0cd6d4cd30957126aed76c5ffc9e2f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10332 bytes

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