Malicious PDF — malware analysis report

Static analysis result for SHA-256 66848aafde0c5b29…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 06:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2d1883284aa63224227f2f91c75e82 SHA-1: 5af6d5ce86b28bce454682f5aababd4fdfe122b8 SHA-256: 66848aafde0c5b294b6fe1898c311d757959388cda78b0e3213f866488182194
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking Shopify URLs, suggesting a link farm or SEO spam campaign designed to lure users to malicious sites.

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.cc/pify?keyword=maa+durga+bhajan++mr+jatt
    • http://files.jerrysmithoffices.com/uploads/1/3/1/0/131071082/3403402.pdf
    • http://files.hubbellbros.com/uploads/1/3/0/9/130969656/80fb7ded0fab.pdf
    • http://rifuvugoj.boreckyfruitfarm.com/uploads/1/3/1/4/131437237/7180691.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/botukevimozuterinox.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1014/files/something_somebody_anything_anybody_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/toximibuke.pdf
    • https://cdn.shopify.com/s/files/1/0432/7725/4812/files/ahmedabad_news_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/zumepamirelusamifamokid.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/hdfc_mutual_fund_application.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/jikirog.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/computer_abbreviations.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/basic_income_tax_course_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/metal_hammered_into_thin_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/6077/1481/files/78647240603.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/70227454385.pdf
    • https://cdn.shopify.com/s/files/1/0432/3403/3824/files/kasodoram.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/wigijapuzu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fbb.bin
1ee6181131ab2574ab2dc110dda3b7a0c4fa51813564388e751b3fd9833b1b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 5252 bytes
font_01_sfnt_off0000716b.bin
d0c22638237a7499a5646011bd1a4a6487b9366f0040558c0337fcc4ef576f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 14708 bytes

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