Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e67eab250fea38…

MALICIOUS

PDF

36.8 KB Created: 2020-08-30 02:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55229d1edb11e0aa74ab4dafb4eeb98 SHA-1: 5d5aa6554b6280fd799e5a092be53ed9f8e4bbad SHA-256: 42e67eab250fea387c725ce867310d1d90df88be97a3ebda0d0f8b6eba073808
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, reinforcing the redirection attempt.

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/wix?keyword=finding+nemo+angler+fish+dvdrip
    • https://static.usrfiles.com/ugd/b8c837_0d1c67659093413da620fc3c1c1b5d42.pdf
    • https://static.usrfiles.com/ugd/432b07_6d960cfb1d2149a3b50f64f4b7faaa39.pdf
    • https://static.usrfiles.com/ugd/d78803_6a45d7587773426eb1f384d897d4b094.pdf
    • https://cdn.shopify.com/s/files/1/0451/7101/5829/files/smoothie_diet_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/komobosam.pdf
    • https://cdn.shopify.com/s/files/1/0434/2824/9767/files/definicion_de_oliguria_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/xojesanidamovilam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/73838640413.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/fabozimipub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/design_agency_brand_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/22085533748.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/javascript_merge_arrays.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/lefesuzufone.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2571/files/fenubenanikukobelagirud.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_off0000528c.bin
8dfc8853622ceae405057f24d46ae6a249992356dae64d0d386f5fd00684d097
pdf-font-stream PDF embedded font (sfnt) at offset 0x528C 5468 bytes
font_01_sfnt_off00006502.bin
eae8086eab93c9269378e62fc0dd936b82d0e15ed33c05063b75b4200d591ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 9816 bytes