Malicious PDF — malware analysis report

Static analysis result for SHA-256 c737dabf2e5601db…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 16:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c6d946529a805ea1f01d21aca3e35d6 SHA-1: 8f0fbffa2f2db110d88a616e5f07289e83527c42 SHA-256: c737dabf2e5601dba7ac5355e6b233864b2a9e99d7b44a84436905944e3f3d30
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though malformed, contains the same text as the URL's keyword parameter, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, likely for SEO poisoning or to spread malicious content across multiple domains. 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.ru/pify?keyword=function+of+local+government+in+malaysia+pdf
    • http://files.stfrancisbing.org/uploads/1/3/2/7/132712222/d07408.pdf
    • http://files.cuyaramidwifery.com/uploads/1/3/0/7/130776298/legejumumopoxoto.pdf
    • http://files.casa-de-colores.com/uploads/1/3/1/4/131437283/9955421.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/mafipekuzuzekadofexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/50531707286.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/pugofoduwanakam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5422/7871/files/anlise_morfolgica_de_frases_exerccios.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/bajezidazofogevipiluma.pdf
    • https://cdn.shopify.com/s/files/1/0437/6277/8264/files/rebasasewezidanosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/dalowoliweja.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/14202189020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/jewadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/wonuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8917/files/wakedo.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_off0000668f.bin
b12abe73bd4b5cfb276dc956d35fadb13804b82bb175e98054b7e3cc9496840d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5592 bytes
font_01_sfnt_off00007997.bin
624b52460cbb46edcaee31256cd405f4c32c12c459fd7f6ffaa9a537b9be652b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7997 9824 bytes

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