Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e581761b4f6a8a5…

MALICIOUS

PDF

32.6 KB Created: 2020-08-18 22:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a00c2099023d6fcada6d7043e8dbf1d9 SHA-1: 63a248b9910d7f95aa23e15f497af3c989878ef3 SHA-256: 8e581761b4f6a8a5e62b5771f55e6a06d9e48764932976725010fb7f28b68def
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.com, which is disguised as a test document. The document body also contains this URL and numerous other links to PDF files hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=reported+speech+multiple+choice+test+doc
    • http://files.melissaavitale.com/uploads/1/3/1/6/131606605/bopomuwebaxewete.pdf
    • http://gitatole.ciscodigitalnewsroom.com/uploads/1/3/0/7/130739783/7597577.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/46310554572.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1251/files/viking_range_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4982/6969/files/xifajozizobevemoxorin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/bobina_toroidal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/68829743845.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/vonev.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/fafuligijotato.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/nazumalemevifilitofixuzad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/66139308118.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/42617046767.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/radical_honesty.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_off000043eb.bin
fb518f1438aa0fc67d4111aa37b7e9e162e4a28a09c42daaeb7f93ebbd06819b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43EB 5112 bytes
font_01_sfnt_off0000552d.bin
5e2be5af142aba52ac127d03c54eb9c8df8aa72ab31b1be036d3e752673239ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552D 9416 bytes

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