Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4dca63534428e3…

MALICIOUS

PDF

45.3 KB Created: 2020-08-26 09:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad35057eb22bdb5743f9323ff250e8ea SHA-1: aca96a4f90fae7c52bdd98c7d123dfc3a8a933e8 SHA-256: 9f4dca63534428e3d8c6b7ec3d4f399bfe848ca8fb47025ed7254382ea3a8a5d
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic indicates a malicious redirector link, suggesting an attempt to lure users to harmful content. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text and embedded URLs, reinforcing the link farm and potential redirection attack pattern.

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/pify?keyword=amylase+rich+food+ppt
    • http://bavebup.lakecountyiltransition.com/uploads/1/3/1/4/131438539/9653562.pdf
    • http://files.michellempnd.com/uploads/1/3/1/4/131452944/4679515.pdf
    • http://files.carolinacavaliers.com/uploads/1/3/1/3/131398134/wiwusepitenunatirebe.pdf
    • https://cdn.shopify.com/s/files/1/0464/5388/3048/files/zileru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0985/1048/files/megokupiratavodaru.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/gigemumibutawesuwafez.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/94375506340.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/lotedi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/gurawizaru.pdf
    • https://cdn.shopify.com/s/files/1/0437/2784/7576/files/japanese_reading_practice_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/datobalunuranedosavofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/16127361150.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/meleroduviwurolobob.pdf
    • https://cdn.shopify.com/s/files/1/0428/5559/6198/files/vitopovuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/foremupubabixufagevagexur.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_off000071b0.bin
ba09a72778811885b08467cfeabdad5778e8ce1eab55623004fc31ca3b36bfdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 5484 bytes
font_01_sfnt_off00008433.bin
fc73352c6074cd6ecfc41f240d11d022937d202782f6dc21dd9f20561396031f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8433 10200 bytes

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