Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9afc027981efeb…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 20:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2276b3a4ad1536cc0b0fb33e0429cd1 SHA-1: 040c417ef1bea14cdccb6ca106acf5c1b4ef59f0 SHA-256: 4d9afc027981efeb1685adb6256536bce46d49505fd5cc5546a8114118279ce2
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one identified as a malicious redirector. The heuristic firings indicate this is a link farm designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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.com/wix?keyword=root+words+list+and+examples+pdf
    • https://static.usrfiles.com/ugd/b8c837_da61417200a94ceba3db15df1b75b394.pdf
    • https://static.usrfiles.com/ugd/3aee12_8490489bdf3a46d09b943061bb2c07e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b807141955ef4b10b45a1f6f3750c3ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd7f8ff25d8455e83d95834c6718109.pdf
    • https://static.usrfiles.com/ugd/3b0c81_83ed50f59b834d118948d0dbc29fb7f6.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/72112760036.pdf
    • https://cdn.shopify.com/s/files/1/0450/3240/7198/files/68021453992.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/mibofik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/42119489271.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/49976667778.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/dopin.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/tesifexodomosis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/bufisomufixo.pdf
    • https://cdn.shopify.com/s/files/1/0450/7212/2006/files/creative_writing_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/danavipoted.pdf
    • https://cdn.shopify.com/s/files/1/0433/4944/2713/files/sujufotefuzapi.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_off000064bb.bin
06d6268cc85fd5590af58d6d34a69cf4a5e6ad9b3d6df6f48850ebd58c30530c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5356 bytes
font_01_sfnt_off000076f6.bin
ee554189dcbeb2635d791d05efbbe6d6e7aa32ff68bec5214626bc5758b6fe6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F6 10120 bytes

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