Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4126c22f5574d01…

MALICIOUS

PDF

48.4 KB Created: 2020-07-27 13:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48248746f3da78be1e65b1f39b13567 SHA-1: d50e53080c63588e401cc0cd459a40f1abed677b SHA-256: d4126c22f5574d01825505cba50cc6e6a4429777f1e215ca7a7d3bef61ac9ac2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary links redirects to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The overall pattern suggests the PDF is designed to drive traffic to external sites, potentially for SEO spam or to lead users to phishing or malware download pages.

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=fieldcrest+supima+classic+hemstitch+sheets
    • http://files.labyrinthcreations.com/uploads/1/3/1/6/131606325/9aa30b028b5b55.pdf
    • http://files.kyoeiuni.com/uploads/1/3/1/3/131380596/fopuvujenoka_gawimabe.pdf
    • http://files.poulstead.com/uploads/1/3/0/7/130740510/kizigeko.pdf
    • http://files.thetravelingtacos.com/uploads/1/3/2/8/132814415/8763980.pdf
    • http://files.coolmetoday.com/uploads/1/3/2/3/132303314/kowawixaxe_ronuvima.pdf
    • http://files.kyoeiuni.com/uploads/1/3/1/3/13
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/77047042973.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/kipepizewapotamiwikod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/jenanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/kibolegoxefaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/31855603102.pdf
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/43367247704.pdf
    • https://cdn.shopify.com/s/files/1/0437/1005/4554/files/71310852971.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/lojutebizedebiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/zutadokazaxeputi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/51866917976.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/90820267541.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/71479786954.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/faxofadevu.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_off00007db6.bin
4c5766d14f1593198b4ad17a10b21db99bd57fe1202f249ef7c2c60eb057d559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB6 4936 bytes
font_01_sfnt_off00008e70.bin
08510a898b09c51839fe9b3ec5fef8df3087cd376f3f252cd537fd4678dc2271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E70 11044 bytes

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