Malicious PDF — malware analysis report

Static analysis result for SHA-256 d553729a5690f342…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 04:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f05d4eb5b06d0572d38fdc4aee29c87 SHA-1: 0990e16998c60e7992f69649ca88f291a763d3ea SHA-256: d553729a5690f3426eb588b7989bd307cbc9f10b31dec8598d54a8d161e7e884
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link and a link farm. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a job appointment letter. This URL, 'https://ttraff.cc/pify?keyword=job+appointment+letter+for+new+employee+pdf', redirects to potentially malicious content. The presence of numerous links, many pointing to Shopify domains with PDF files, suggests a link farm designed to attract search engine traffic and potentially distribute malware.

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=job+appointment+letter+for+new+employee+pdf
    • http://files.clearwatermusicserves.com/uploads/1/3/0/7/130738859/sujazefutog-fowamuzibefazop-medutu-sujudavagevakax.pdf
    • http://files.upwardmvmnt.com/uploads/1/3/2/3/132302764/pibisu-zabaxigizav-jeremara.pdf
    • http://files.masterthompson.us/uploads/1/3/1/8/131857758/d0175694.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/51731514660.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/achaemenid_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0434/1327/4780/files/mofaruliribatoxudejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0440/2534/8261/files/undang_undang_dasar_1945_amandemen_4.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/kizigowetutina.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/11278775785.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/5905758026.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/75811659542.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/100_canciones_y_acordes_de_guitarra_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/zipigumedafojanajaserebil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/17373670849.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006734.bin
f381a25043b114fdc93e86cb38f79a5ebe4bac40e180d3a0397a73bcbaa6a7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6734 5120 bytes
font_01_sfnt_off00007887.bin
f135fb83593693b7cd75b88e351af9dc873db15ecc28b5bd0397529815bdd473
pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 10076 bytes
font_02_sfnt_off00009b21.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B21 4324 bytes