Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4be5802609ec3c2…

MALICIOUS

PDF

39.6 KB Created: 2020-08-23 18:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e48e977f44a114f21f74feadb7114d3 SHA-1: 0fc0393722c3476c2c7c56c8431e16154e74893e SHA-256: b4be5802609ec3c25045cdcca960d4706c6d3351c34421ce3daabc943294e62b
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a cleaning schedule template. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL that is likely intended to be clicked by the user.

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/pify?keyword=weekly+kitchen+cleaning+schedule+template
    • http://xepevewag.motherworkscville.com/uploads/1/3/1/4/131452825/nolokinujim_sutuvipotut.pdf
    • http://files.ledsignsnow.com/uploads/1/3/1/0/131070581/9246722.pdf
    • http://files.lgpotter.com/uploads/1/3/0/7/130775145/7745845.pdf
    • https://cdn.shopify.com/s/files/1/0435/7298/6014/files/55155809269.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7159/files/barbablu_amelie_nothomb.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/debiwagukatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/33700397693.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/xipiwozewonuxilezoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/vakopujewovojeduxudi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/30741777046.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/95126380244.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/65931413301.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_off00005c02.bin
9af1a327e2bf357996aeb9fe32150fc614fdad3452305072b61f398251a6c1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C02 5568 bytes
font_01_sfnt_off00006ed8.bin
c3eedc5efa90f50070a51a30308f8a1a8aa11aadf0ebe466244292758991df01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 10188 bytes

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