Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97a9d4f1c593048…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a663148f43c5f414ea9b7110136677c4 SHA-1: e866e82a4f14565cbd175e5ce2c41c64263bd583 SHA-256: f97a9d4f1c593048418ba6555865fb1a610cca25d59723e137c84723d8a29e64
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text suggesting a lure for a free PDF download, which aligns with the malicious redirector. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload or lead to a phishing site.

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.cc/wix?keyword=delta+of+venus+anais+nin+pdf+free+do
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/78199884573.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2247/files/41737665451.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/niedermeyer_s_electroencephalography.pdf
    • https://static.usrfiles.com/ugd/2c8d66_e120cd51eb864fe59c3c0355d795eb3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0815ec8331345a7bc46d36015fc39ff.pdf
    • https://static.usrfiles.com/ugd/6f7357_7e86e5c411914c90a2cbff9bd65d63d9.pdf
    • https://cdn.shopify.com/s/files/1/0437/2951/8741/files/zugiwarow.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/futipuzatovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6678/files/marriage_license_application_nyc.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/54021113413.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/analog_clock_template.pdf
    • https://cdn.shopify.com/s/files/1/0461/9704/7447/files/60906628293.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_off00005b9b.bin
19f81ecaff126f17afbfb9e7e3f533825b5195107b2ba857c75a447f60efb312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9B 5096 bytes
font_01_sfnt_off00006d0e.bin
868e716eebb089d975b74e380e52a50afacd42f29b75a13514a5c86ca7f76636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0E 10288 bytes

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