Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a151d23a1c61836…

MALICIOUS

PDF

47.7 KB Created: 2020-08-29 21:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b81f4b9390eef026aaa0bfc8e9b0b669 SHA-1: 35fc5c1a7894a673d0ecfc311648ebc628fd1cb3 SHA-256: 3a151d23a1c6183642934eadfb55e1fe7678ae60f7c7812a411a30a286369f8a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=abscisic+acid+in+hindi'. Additionally, it exhibits a PDF link farm behavior, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0430/6989/8909/files/third_party_insurance_rate.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL, suggesting a lure to external malicious content.

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/wix?keyword=abscisic+acid+in+hindi
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/third_party_insurance_rate.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/71773190762.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/detigoro.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/jedazesofodudif.pdf
    • https://static.usrfiles.com/ugd/f55bec_aee195ed8077485184f7512b2191ca8e.pdf
    • https://static.usrfiles.com/ugd/accd1f_410088b7f1f64bd79eb0fdf2932352fb.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/pec_minor_stretch.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/616687183.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19085525902.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/37415127095.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4871/files/xexotovinazepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/nitokelazov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/how_the_grinch_stole_christmas_download_in_hindi.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_off00007aad.bin
2fe552b0260eeb73ede42d569fffcd60d9aaced5873bd7487b5d35b412b4bb49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 5028 bytes
font_01_sfnt_off00008bb2.bin
024d48de69236113f29e9fa2a1dfef476b27166abbe57183715381dd00d2bb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB2 11340 bytes

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