Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a45c8ccbe7b09a8…

MALICIOUS

PDF

36.0 KB Created: 2020-08-22 08:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa4abe80e2ef5116b8fa9facd6099f3 SHA-1: 68c6a161f17c9a85bfe1d59a513e5dceae314ea5 SHA-256: 8a45c8ccbe7b09a8cb302f0431d1987bab701ab4f5a87eac9e2acf6bb078d02d
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links redirects to a known malicious infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' for 'Bastien piano for adults', which serves as a lure. The presence of a malicious redirector indicates an attempt to lead the user to a compromised site or download further 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.ru/pify?keyword=bastien+piano+for+adults+answer+key
    • http://ponurej.twirlyful.net/uploads/1/3/1/0/131070374/faxafo.pdf
    • http://tinabuful.nickydelariva.com/uploads/1/3/0/9/130969260/mudub.pdf
    • http://files.breathewithlauren.com/uploads/1/3/1/4/131437351/424db3.pdf
    • http://files.stillyriveryarns.com/uploads/1/3/0/7/130738712/6066949.pdf
    • https://cdn.shopify.com/s/files/1/0438/6104/9494/files/zidelot.pdf
    • https://cdn.shopify.com/s/files/1/0450/5698/3192/files/27460012276.pdf
    • https://cdn.shopify.com/s/files/1/0434/9352/3618/files/92824627847.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/musivugazogodosolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/86163022293.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/dodurewovov.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/56599805682.pdf
    • https://cdn.shopify.com/s/files/1/0436/0513/1421/files/38473800819.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_off00004e0b.bin
77e7bb55c18b8a3fd4c32d83aa85ff59c3737f82b99b0834fe29a1c8830a9fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0B 5344 bytes
font_01_sfnt_off00006056.bin
a8f8322bfb86640d52d04146afa7f4b6c32f4c4ff100a07d58125c9ba5b76773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 10200 bytes

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