Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc5c820ae8a6c13…

MALICIOUS

PDF

38.8 KB Created: 2020-08-15 03:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7c28f1fbb45c4796883cc72eb0170f5 SHA-1: 12c00017ae79bd9cd0d3736bbca6335a3157d9fc SHA-256: 8fc5c820ae8a6c13da60483516cd4905119eaa4d98f812ca9bda5557688d8257
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.cc/wb?keyword=logo%20design%20process%20pdf'. The presence of a link farm and the ML classifier's high confidence score further support malicious intent. The document body appears to be corrupted or obfuscated, but the primary attack vector is the malicious redirection.

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/wb?keyword=logo%20design%20process%20pdf
    • http://bewuwuv.firstencounters4babies.com/uploads/1/3/1/3/131398489/pufutogikonorixeriki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/frost_dk_bis.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/orthographic_to_isometric_drawing_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/zalitolelariporidowof.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/egg_biryani_recipe_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdf
    • https://cdn.shopify.com/s/files/1/0440/4304/2966/files/37449228616.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/organic_chemistry_acs_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/varuve.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_off00005c32.bin
3d37d4b8ff14bd58c7f012f2e282037fe3c8de8fba58026fb19618a1716dcab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 5020 bytes
font_01_sfnt_off00006d5f.bin
a7cde3a2819ee47a6033633ba598fa14b29532c50122bef28079f2e6bbacc98b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5F 9904 bytes

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