Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fdcd85f9c3272…

MALICIOUS

PDF

39.0 KB Created: 2020-08-13 00:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eb431db506b8335ed742e111d043032 SHA-1: 258c6d835fadb4b57e6015cbc5b0dbb9113accb7 SHA-256: 528fdcd85f9c3272b3743e4003b3bac3753e9d912f6799e240166dedf0a4fef1
120 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text "Cdsco guidelines pdf" and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, many hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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/pify?keyword=cdsco+guidelines+pdf
    • http://xazatedax.kwdllc.net/uploads/1/3/1/6/131637814/6274486.pdf
    • http://files.joplatesnweights.com/uploads/1/3/0/8/130814926/pisusonipeleti_bewegatukarokok_vokikima_bolerebaresopuf.pdf
    • http://files.phsdbteam.com/uploads/1/3/1/4/131407958/682254.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/43325130570.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/rokekupizefumapaganuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/how_to_unhide_a_post_on_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/69282585011.pdf
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/psychological_assessment_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/bupixetibipowonewipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/xatadepesurekapadipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/18708983069.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3386/files/tufipat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/fiwotuwobod.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_off00005c60.bin
a00ce808a472e40449a3c5a374c0e67d4d3a221537ebb63fd41ab8549f5410cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 4924 bytes
font_01_sfnt_off00006d3b.bin
18c905fb382146ee7accab51d0aa8bcdf545125c41e6903b83025b9feb762e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3B 10108 bytes

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