Malicious PDF — malware analysis report

Static analysis result for SHA-256 23efc8e1f1db31db…

MALICIOUS

PDF

44.7 KB Created: 2020-08-05 16:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49d85052b7b2d7214a159b00d311e026 SHA-1: a01a86519d0e11a438160f868c15af64add85613 SHA-256: 23efc8e1f1db31db4b22d29915306e7be6189f5079ec968669ff8147cbb58fa9
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=lightest+pdf+reader+app+android', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary goal is to trick users into clicking it. The file was generated by wkhtmltopdf, a tool sometimes abused for creating malicious documents.

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=lightest+pdf+reader+app+android
    • http://rujefor.friends4picacho.org/uploads/1/3/0/8/130813095/28e12f7f6848e.pdf
    • http://xejopolu.penangfloorball.com/uploads/1/3/0/9/130969489/nekapesit.pdf
    • http://files.iccspa2020.com/uploads/1/3/1/3/131398246/kudokabuxikufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/76155031070.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/51310772950.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/39186818272.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/happy_stick_skin.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9946/files/13894167204.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/428547325.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/riror.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/juzabivedolaguteli.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/vovozote.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8991/files/newufikafusijabod.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/zovidanobikotokugiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/common_3_letter_words_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/kupab.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_off000070be.bin
69b3feb4eddcdf88413456eda343a923cad1f8fac859172eddb8f3127bdf2938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BE 5212 bytes
font_01_sfnt_off0000827b.bin
fda1cc6b004dc5b66b6685f89a21423c8cb4be22ecdd8d8c78d913d3dd7d3141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827B 10300 bytes

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