Malicious PDF — malware analysis report

Static analysis result for SHA-256 c811ad96d817bf3a…

MALICIOUS

PDF

38.2 KB Created: 2020-08-15 22:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284bfb961a2183cbbc2378e1234be47c SHA-1: 8152d67704c177f27ed42d2262edde2144544c67 SHA-256: c811ad96d817bf3a1e407c355b9758b662b6002e37af81979c2d1c73190f89aa
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious domain, ttraff.com, under the guise of providing 'first grade esl worksheets pdf'. This indicates a social engineering lure to direct users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/wb?keyword=first%20grade%20esl%20worksheets%20pdf
    • http://files.honeymaice.com/uploads/1/3/0/7/130775762/ligegilijol.pdf
    • http://miwetab.h2hclaystudio.com/uploads/1/3/0/8/130874457/2346916.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/nexewoluk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1382/files/da_form_2765_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/73234497177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/dozaruja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/6925178179.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/78310361935.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/argumentative_essay_structure.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/tixalawerolutewavogowu.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_off000056f6.bin
a3d246c9676271517a1bf07eea6f0666c27e8b8b9ce319bfb23bd44897685574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F6 5412 bytes
font_01_sfnt_off00006969.bin
b75c03c00b08198ab949e98f4e60f02cdadea6a55715fd3f1ef136b6d9f46e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6969 10296 bytes

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