Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9428d708daecf…

MALICIOUS

PDF

56.3 KB Created: 2020-08-25 03:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe67a2dd199b157e8281c61c3d74c88 SHA-1: 4a36032276d841bfd5e03b233ae2ba0330d95321 SHA-256: 90e9428d708daecf3e264027a7b6d918ebdcaa93b9f53955208cf6b227a9df0b
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a Korean address in English format, aiming to lure users to a malicious site. The document body and heuristics confirm the presence of multiple external links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=korean+address+in+english+format
    • http://files.meredithmcginnis.com/uploads/1/3/0/8/130874482/b67dbf00f.pdf
    • http://kizuse.efkaeding.com/uploads/1/3/1/4/131453293/ludapapibenugujexu.pdf
    • http://xabureser.german-teacher-online.com/uploads/1/3/1/6/131606066/6ca7e.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/18004696959.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/zilurupititaguxotep.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/hadley_wood_golf_club_course_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/central_venous_pressure.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/zolodawisefuzujowelipuwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/grateful_dead_shakedown_street.pdf
    • https://cdn.shopify.com/s/files/1/0448/2990/0957/files/fumugolexoxoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/lepofesewogasoxopavemat.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/efns_guideline_treatment_cerebral_venous_sinus_thrombosis.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/sinusitis_antibiotics_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/banemisosuda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079d3.bin
a9a942d90fb06158ae2a2f76427739cbf1374887d1f80a7ae1e4f7e1f2fb887c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D3 11204 bytes
font_01_sfnt_off00009ea4.bin
9e9d4435f595c254f6128cbb244824196c82d3a4c11e1449b45cdb46cedde633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA4 5288 bytes
font_02_sfnt_off0000b071.bin
53b3dec4c6252fab584c5a9bb0deedef10071dd552c16df53096bad45aee062f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 10436 bytes

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