Malicious PDF — malware analysis report

Static analysis result for SHA-256 335e44958dc9c934…

MALICIOUS

PDF

55.7 KB Created: 2020-08-04 15:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be7920007594a67985d4ec906181b4ed SHA-1: b3a54097a682e2ae8d4f9bae07ce615f2603b144 SHA-256: 335e44958dc9c934ccddf44bbe347ce5f47b26784c395c0e7c16facbea9d44c2
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=arduino+full+course+pdf'. This indicates the document is designed to redirect users to malicious infrastructure. The document body, though heavily obfuscated, contains embedded URLs that are part of a link farm, further supporting the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=arduino+full+course+pdf
    • http://files.newarktherapeutic.com/uploads/1/3/1/3/131383247/12fe6aaa.pdf
    • http://files.aarondarling.com/uploads/1/3/1/4/131483053/3774913.pdf
    • http://files.faithacademyashland.com/uploads/1/3/0/7/130739214/1f488a9dae7.pdf
    • http://files.learningforlittlepeoplepreschool.com/uploads/1/3/1/4/131453950/92198.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/22214879472.pdf
    • https://cdn.shopify.com/s/files/1/0433/5022/9143/files/bimoxuxogixut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4550/3655/files/86761540529.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/sojasazosiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/3966285528.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/2460850508.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/wufired.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/abu_hamid_al_ghazali_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/11549590484.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/56831758502.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/xelefotebok.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_off00008ff8.bin
8b768a7aea60a2c828ac913bbecae411daf85a7520ada070b9298cc53b2c35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF8 4928 bytes
font_01_sfnt_off0000a0d5.bin
38a3bd52730a1d6d3678b561a3c715453f813ebcb320a63db190a722b136904c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D5 15916 bytes

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