Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec271b1b14f6bb3…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 13:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481093856cd06b43686060b5763163de SHA-1: 911f8a5d02b20a4ce69586e2753748051299c5ee SHA-256: 4ec271b1b14f6bb33d8ca6c4ce2720a5e8be2e77df5045061667d04fd6dea522
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'basic math placement test pdf'. This link likely leads to a malicious site or further download. The presence of a large number of SEO-optimized PDF links suggests a link farm or content stuffing technique to improve search engine visibility for malicious content.

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/wb?keyword=basic%20math%20placement%20test%20pdf
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdf
    • http://files.christinamariecaruso.com/uploads/1/3/2/6/132696483/2019187.pdf
    • http://vibux.southcoastdesign.co.uk/uploads/1/3/1/3/131381464/bf98023e8c.pdf
    • http://files.judyatraveny.com/uploads/1/3/0/9/130969472/vutuzu-guxefavomowix-gemoretisuxevo-kekoxuranu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7087/4009/files/sazetatepadutunujutineg.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/kedoletuxolulefivugaso.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3270/files/the_analysis_of_biological_data_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/gifiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/50198309466.pdf
    • https://cdn.shopify.com/s/files/1/0434/8516/7766/files/duxilenunuzazamonadilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/67932984060.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/basic_korean_language_learning.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/liduwikinanexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/lajepomoromapometula.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/73497358106.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/xirozizigasadujaxiwogunu.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_off00006c38.bin
a366f63f80ef377f5b61b14d35cb60fdacd8e94410cc75b655b1591cc78b9e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5348 bytes
font_01_sfnt_off00007e43.bin
e36cf0ef3545e4eede9562a1de7924428e3ca8a6c108aa64a852b374428597e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E43 10140 bytes

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