Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd947f8ffdf555a7…

MALICIOUS

PDF

43.5 KB Created: 2020-08-04 16:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31867b799ac7dbe52d1afbcecdc6e4c2 SHA-1: cb3fb1844c395f6fb040bbbdbdda140d42b96a1d SHA-256: fd947f8ffdf555a7762b06d2e89f327b4c5ac434ddd67624c2cdc336d5571100
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector, indicating an attempt to lure users to malicious sites. The document body, though malformed, contains text related to 'Biology notes' and a URL that appears to be part of a SEO spam campaign. The primary malicious URL identified is https://ttraff.ru/pify?keyword=biology+notes+for+class+11+all+chapter+pdf, which redirects to other PDF files hosted on Shopify. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=biology+notes+for+class+11+all+chapter+pdf
    • http://jisekur.route2fitness.co.uk/uploads/1/3/1/3/131379706/6ba2094f3.pdf
    • http://files.health-and-wellbeing-week.co.uk/uploads/1/3/1/4/131452929/fapibuxaso.pdf
    • http://files.millerwebdesignservices.evansconstructionconsultingllc.com/uploads/1/3/1/8/131860938/xexugikirav.pdf
    • http://files.slcsupplychain.com/uploads/1/3/0/7/130739510/togomikaleros_retekak.pdf
    • http://files.hansonartdesign.com/uploads/1/3/2/6/132695719/6ee9d792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/30778034151.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/bazuronav.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/20165308962.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/wozis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2644/files/zisetedapelipoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1257/files/ralewovelodonekip.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/28714248888.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/visebexi.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_off00006aaf.bin
30ceaab71c50e02e1d8935a998d3f10a41b03c7d49be7d27ed36e2c98648d8fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 5620 bytes
font_01_sfnt_off00007de1.bin
1d269f2987aa49c09e0a9a7f74ee3a619a91fe09b0d682618aff65a3c783a2db
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE1 10168 bytes