Malicious PDF — malware analysis report

Static analysis result for SHA-256 3328f3878cf0a4aa…

MALICIOUS

PDF

45.1 KB Created: 2020-08-02 09:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff9f96cb0baae9974a0bd9655edba97 SHA-1: 7ffae174ad235671b7f0b79f2276dbd604398b5d SHA-256: 3328f3878cf0a4aa2ab9cd6c4353dec62c73a98970325d492d05dd7f607d342f
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains, including a large number on cdn.shopify.com. One critical heuristic indicates these links are part of a link farm, and another flags a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL.

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=c+clear+input+buffer
    • http://files.transparentfinancialinc.com/uploads/1/3/0/9/130969037/2648441.pdf
    • http://files.kelliescompass.com/uploads/1/3/1/4/131437676/afff9a10f6.pdf
    • http://files.thatsclass.com/uploads/1/3/1/8/131871902/4463036.pdf
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/80505779917.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/35969064166.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/48151231628.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69298849274.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/key_and_peele_nfl_names.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/varabekisaruzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/nemugugegibabez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0894/1467/files/gesirizegepogaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2896/3747/files/42330602171.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_off000068e9.bin
1116640a86327477507360bd17982c3db103e750dfed743150035c85f9924015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E9 4876 bytes
font_01_sfnt_off00007989.bin
0d54d6b6a4cd3b3f3242103934d3c731dac9816ce942e5bd4ce9d6381240382b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7989 14636 bytes

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