Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abbf0d04a1adb68…

MALICIOUS

PDF

53.9 KB Created: 2020-08-02 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75cdc64d71bc143167cab18bd30c961f SHA-1: 44f390dc7408954be7810c73c48e1ae9a18f9ea6 SHA-256: 3abbf0d04a1adb6884ae269f33bc78ce538eb9cc0dd406d1945f2337a57797b1
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Walmart w2 online', suggesting a phishing lure. The PDF also exhibits characteristics of a link farm, with numerous external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious IOC is the redirector URL.

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=walmart+w2+online
    • http://files.nsbonline.shop/uploads/1/3/0/7/130776490/5405527.pdf
    • http://files.varsitystitchshop.com/uploads/1/3/0/9/130969390/7730339.pdf
    • http://files.knappbiz.com/uploads/1/3/0/7/130776220/lufotinabuzezobaf.pdf
    • http://files.emmazang.net/uploads/1/3/2/6/132682110/1598507.pdf
    • http://files.rostrevortennisclub.org/uploads/1/3/0/7/130739474/xajokanarefo-gabeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/4009719949.pdf
    • https://cdn.shopify.com/s/files/1/0433/4898/3959/files/js_random_string.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/84926254455.pdf
    • https://cdn.shopify.com/s/files/1/0433/2922/4857/files/bupusokusexedurod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0435/5083/4847/files/49801964296.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/42836703816.pdf
    • https://cdn.shopify.com/s/files/1/0432/8865/8078/files/82667286324.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/59578289991.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/suvobetizilafoja.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/61821374670.pdf
    • https://cdn.shopify.com/s/files/1/0431/2485/0842/files/99297733931.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_off0000959e.bin
a588b7bb5f1bb1c87722ffa9141f89e26cdd401ee4ed66c57b33c8f7d129ffb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959E 4892 bytes
font_01_sfnt_off0000a63f.bin
2ca1602185b43a175bd652d4012686f865a3edb524ee81656c9c77f1d16ade4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA63F 10624 bytes

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