Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4815cd6663fe709…

MALICIOUS

PDF

51.7 KB Created: 2020-08-12 11:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa14433719becfd2f89f02a9a6822453 SHA-1: 8f7e7a22c7adcbe2bac55072427584e0dbdcd2f5 SHA-256: c4815cd6663fe70954d48d4a6912cc08b8348997f1a933035626c1c6e6889a4c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=negative+prefixes+2+pdf. The document body is heavily obfuscated but contains this URL, suggesting the document's purpose is to lure users to this malicious site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=negative+prefixes+2+pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • http://files.melissaholden.com/uploads/1/3/1/8/131856904/fegonegan.pdf
    • http://files.epsaofficial.eu/uploads/1/3/0/7/130738548/850429.pdf
    • http://dajavemu.makersnextgen.com/uploads/1/3/2/7/132710621/kebefenet-zorokudabiri.pdf
    • https://cdn.shopify.com/s/files/1/0436/2915/0368/files/wujibibamogelugelezadix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/96972093377.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/31008555602.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/bidal.pdf
    • https://cdn.shopify.com/s/files/1/0439/1324/8923/files/damofumew.pdf
    • https://cdn.shopify.com/s/files/1/0431/3956/3686/files/munipizovazof.pdf
    • https://cdn.shopify.com/s/files/1/0447/0882/3193/files/bise_lahore_9th_gazette_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/income_tax_amendments_for_fy_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78030006053.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3738/files/gepopurotepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/zurudumakamumipemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1323/files/vitupowabaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/cuaderno_para_colorear_mandalas.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_off00007d2c.bin
a0f33d426cb6679d84ffd415c8888109012912c20fac69281f23b333ed129dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2C 5408 bytes
font_01_sfnt_off00008fb4.bin
97874f423e75d061d02f7269d4b6ea48f94898a5d0c48c4bf8f321bfc54aa5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB4 15600 bytes

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