Malicious PDF — malware analysis report

Static analysis result for SHA-256 131dd0f60fb15183…

MALICIOUS

PDF

50.1 KB Created: 2020-08-07 18:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b48b29439d0353dcf0f0f8b27a959433 SHA-1: 8ff12a256f247ab8867317759e89eb9961d5c0ea SHA-256: 131dd0f60fb1518338d845201b73cf3524813dd7ca864430fd032d22884b39e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm and a redirector to a malicious URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to a "construction agreement format in tamil pdf" and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous links to external PDFs, many hosted on Shopify, further supports the link farm heuristic.

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/pify?keyword=construction+agreement+format+in+tamil+pdf
    • http://files.danielleleefphotography.com/uploads/1/3/0/8/130813118/eae0f2e8e.pdf
    • http://mizul.melissavanepps.com/uploads/1/3/0/8/130813612/romulufubegexotaxufu.pdf
    • http://files.ceciliadesigns.com/uploads/1/3/0/7/130776493/xelukowu.pdf
    • http://files.m28global.org/uploads/1/3/2/6/132682882/puvujaju-kogubedeberumej-wosesudige.pdf
    • http://laxuk.esterdeboerillustration.com/uploads/1/3/1/6/131606027/serufevudefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/59241949655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/ascii_code.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/muzela.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/23071305341.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/32600765790.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/dateluzamoluximobeli.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/nabugef.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/r._danny_bot.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/zipizevofegodanaxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/6435871362.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/korawuzasogotuzije.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_off000085a7.bin
d58d05cc85293cbce03060b481584d379b70df6b013a311782e819cf6f7f0fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A7 5380 bytes
font_01_sfnt_off000097da.bin
882076a383673d8c923c007c3fd5e4592d81f579c4c8756813ba1fa18b55c825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DA 10356 bytes

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