Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d5673c383b8859…

MALICIOUS

PDF

48.5 KB Created: 2020-08-12 19:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55db5f84a6c38827615f15bf3dda1f86 SHA-1: e85e0b4d9fa95b2b555927f7d365d79ef22d4737 SHA-256: 53d5673c383b885928cd37bfdb0b99d858e5e9b505d27f8b7bcf5ce851591b5f
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for redirecting users to malicious sites. One such link, https://ttraff.ru/pify?keyword=quantitative+aptitude+equation+pdf, is flagged as a known malicious redirector. The document body is heavily obfuscated but contains references to quantitative aptitude and equations, likely a lure to disguise the malicious intent. The presence of a link farm heuristic further supports the malicious nature of the document.

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.ru/pify?keyword=quantitative+aptitude+equation+pdf
    • http://files.stjohnsatlanta.org/uploads/1/3/1/8/131856569/bawudazog_damisamun_domametid.pdf
    • http://xuvupa.fullyfusedcrafts.co.uk/uploads/1/3/1/3/131380600/zatebizigaxuzenod.pdf
    • http://files.mylittleschooltoronto.com/uploads/1/3/2/3/132302787/dakekum.pdf
    • https://cdn.shopify.com/s/files/1/0433/9354/8444/files/zinozimelemodarumex.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/twenty_eight_the_weeknd_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9167/2736/files/xinimow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/guzutelawufipof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6080/5280/files/3963090283.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/30907363608.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/apocryphal_acts_of_the_apostles.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/limowapofofudofiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/pulse_width_modulation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/58202687971.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e76.bin
fd4e702a728eca843d3027c3e8d06e943c5d96a42cb8d12869e8a1b48ba26eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E76 4976 bytes
font_01_sfnt_off00006f7f.bin
83dee55c7b0653e71d941a76cf9542329d00c4640d629f35da2c6611892b308f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 14804 bytes
font_02_sfnt_off00009e2d.bin
e791c4ddcfb36ad5d2cc0d754440212353412f28a74be6db499f3e68d85a0b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2D 16108 bytes

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