Malicious PDF — malware analysis report

Static analysis result for SHA-256 4577c9a35a8eb42a…

MALICIOUS

PDF

43.0 KB Created: 2020-08-13 21:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a57ce906c7a3843ade137cf9c978e8c4 SHA-1: 5935844ba9086492f1c0f68860d26bb57ed4ce20 SHA-256: 4577c9a35a8eb42add210f80198c414d2e99ca662111bbc6cc14f1300c7ea99d
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=what+is+nitrogen+cycle+very+short+answer', which is flagged as malicious. Additionally, it hosts a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious redirector.

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=what+is+nitrogen+cycle+very+short+answer
    • http://files.fastmolly.com/uploads/1/3/1/4/131453247/jufixovupo-panejaduzo.pdf
    • http://files.sherylmcroberts.com/uploads/1/3/0/8/130813841/1674889.pdf
    • http://donifima.christenenos.com/uploads/1/3/0/9/130969762/6592050.pdf
    • http://files.countrylovelabradoodles.com/uploads/1/3/1/6/131607565/kapajiful.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/34661840706.pdf
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/nakivogupaxezefo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/naberaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1998/files/kevajaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/44857871004.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/nla_assured_shorthold_tenancy_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/radikogojex.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/12137543176.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/guvukuwaxapidemulavokog.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/us_certificate_of_origin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/muslim_girl_names_with_meaning_in_urdu.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_off00006a6e.bin
e5f5a2041b5a16d8997fe03d737038e1cb0b8e0c329aeda97db397117b39ed27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6E 5328 bytes
font_01_sfnt_off00007ca3.bin
2e93e4b8d72670239e68d47b76a8c375731881c03213ff784172827bd7ec092d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA3 9984 bytes

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