Malicious PDF — malware analysis report

Static analysis result for SHA-256 264a671dc090a1a5…

MALICIOUS

PDF

120.1 KB Created: 2020-08-22 07:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b7f0ac0b10bd066a87e1da5716cb443 SHA-1: a8aab3c256c01971d7c6e981b763e988a9ff8124 SHA-256: 264a671dc090a1a5b26e1aa9442bd57e32338db8c06dd8858a91d7d4253b915d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=quenching+medium+pdf'. Additionally, a PDF SEO link farm heuristic indicates the document is part of a larger infrastructure for distributing malicious PDFs. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, reinforcing the redirection attempt.

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.cc/pify?keyword=quenching+medium+pdf
    • http://jisofoj.gianmarcodaniele.com/uploads/1/3/1/0/131070487/zekutadi.pdf
    • http://files.thegovernorspub.com/uploads/1/3/0/7/130738614/mawabiwikaveza.pdf
    • http://gazitoxek.richfeenstra.com/uploads/1/3/1/4/131454215/soxewedulu_xunoromurato.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/15090553650.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/10396665009.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/ways_of_the_world_3rd_edition_ap.pdf
    • https://cdn.shopify.com/s/files/1/0430/5462/9015/files/professional_writing_skills.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/nokagavugebenokinadoserub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7703/files/robisofoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1666/6786/files/adobe_lightroom_cc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/41307008897.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/98545772634.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/annotate_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/81057006338.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_off00019b30.bin
50df5e1e4a5bb7fe58632658c8d5c03e97bedfb3d8791407c5a0cfd102290bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B30 5112 bytes
font_01_sfnt_off0001ac79.bin
dc879db5d7b21d3f8b9c6d4cfb0f4ad7cf5e849e4e891a9821f4db874b3e167c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC79 12012 bytes

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