Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0f551cd728c9da…

MALICIOUS

PDF

41.1 KB Created: 2020-08-09 22:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8aaa98c8f6166522e4cd77c0323e5ef SHA-1: 6cf13ad73f21eac26de95f6a436dd6a3222fad28 SHA-256: cb0f551cd728c9daf921f01b7c4b02cff3ef7ae5541f68e297338df7ac74fbbf
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'assessment year 2020 19 pdf' and includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the true malicious destination.

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=itr2+assessment+year+2020+19+pdf
    • http://files.mylenebaxterconsulting.com/uploads/1/3/0/7/130775980/gikix.pdf
    • http://files.psych205.com/uploads/1/3/2/6/132683088/lixezemosefe_nagovositotuxi_vuwovefeko.pdf
    • http://jovewati.eunsooklee.org/uploads/1/3/2/8/132814930/lulemovuki-kidabubajejupew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/partial_differential_equations_farlow.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/3000/files/wow_classic_mage_aoe_grinding_spots.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/uninstall_java_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2637/files/govaperisedimoditeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74098669839.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/26350436412.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1056/files/71724604216.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/sapusafonuwulafowiwenege.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/supemelavawoneboxajiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/worowove.pdf
    • https://cdn.shopify.com/s/files/1/0430/5243/3557/files/20205478032.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/2574212162.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_off000061f1.bin
ca516bf8b41789566a201df65775cba30abb821b878b9aaf95acb07ee858c81e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 5676 bytes
font_01_sfnt_off0000752b.bin
b8ce079529ba0a22b7b47dd47987499e3765cbe0287ba625c3bfa804195ae287
pdf-font-stream PDF embedded font (sfnt) at offset 0x752B 10116 bytes