Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef80c3b03b8666c…

MALICIOUS

PDF

38.7 KB Created: 2020-09-10 13:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cae4ec40a7b164ef064f63ae366daa SHA-1: 42d2a32f439c781aeaa911e764f0b4ff5ab01ea7 SHA-256: 4ef80c3b03b8666c343a7d3c59cdf57691acdcaae9aaad69444f14e08bf35ba5
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing 'Excel macro save as pdf and open' and a URL that matches the redirector. This suggests the PDF is designed as a lure to redirect users to malicious content, likely for further exploitation or malware delivery.

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/wb?keyword=excel%20macro%20save%20as%20pdf%20and%20open
    • http://files.digitalmuseumofwomen.org/uploads/1/3/1/4/131406258/5740465.pdf
    • http://files.rachaelbabington.com/uploads/1/3/0/9/130969452/1788596.pdf
    • http://venofi.greenacrevintage.com/uploads/1/3/0/9/130969586/7b539fc8.pdf
    • http://dozazot.sfbayareapsychotherapy.com/uploads/1/3/0/8/130814328/2099961.pdf
    • http://files.can-do-fest.com/uploads/1/3/2/3/132303359/5e9489.pdf
    • http://files.andy-weeks.com/uploads/1/3/1/3/131398091/4327358.pdf
    • https://static.usrfiles.com/ugd/ef253e_03cb39baba0b4c31979ebf2c03f11674.pdf
    • https://static.usrfiles.com/ugd/83e24f_a0143560d5fd450295beb2a044a0f009.pdf
    • https://static.usrfiles.com/ugd/ae059d_3a99f9ccfe764cdcb93fd202f65e1a0d.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/kakaotalk_emoticons_hack.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0405/files/sheet_nhc_kht_vng_ma_xun.pdf
    • https://cdn.shopify.com/s/files/1/0439/5512/6430/files/sarcoma_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/2724/1887/files/fairy_tales_story_in_tamil.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_off00005a16.bin
e74a1ad71708f733966f289882efa775a30fb5169647aac90770f476f960160d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A16 5384 bytes
font_01_sfnt_off00006c5a.bin
2474356cc41a8f52e32101ac7f733dfa0c748e0c87420205f2e33845104fcb12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5A 10008 bytes

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