Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9354932f6d455a6…

MALICIOUS

PDF

44.6 KB Created: 2020-08-07 23:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05cd20eef4b0dc40ada1e4cf1ba0a101 SHA-1: c4b61c3891b9b4a7fead8b4e2830e053b6c91c88 SHA-256: b9354932f6d455a692c08e58405a29f53dac927b94e9fdf204080e4efb5d645a
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The primary malicious URL is https://ttraff.ru/pify?keyword=cateter+umbilical+cuidados+de+enfermeria+pdf, which likely serves as a lure or initial stage for further malicious activity. No scripts were extracted, and the document body is largely unreadable binary data.

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.ru/pify?keyword=cateter+umbilical+cuidados+de+enfermeria+pdf
    • http://files.eloraroad.ca/uploads/1/3/0/8/130873846/4351281.pdf
    • http://files.pghcru.org/uploads/1/3/0/8/130814411/jelojivuvaxov-xogopusezidoduk-jifonotajowewi.pdf
    • http://files.kateedgarmusic.com/uploads/1/3/1/4/131413550/vakapipoloxanum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/24383854658.pdf
    • https://cdn.shopify.com/s/files/1/0440/8908/2006/files/gudidowirefabelomonube.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/limibemonibivudirure.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/digital_branding_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/cambridge_english_grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0454/1009/1176/files/history_of_mathematics_education_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/22698748880.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/45468894341.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/xujasisanaduvovubuzepal.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/3d_max_2020_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0450/2428/0726/files/kindred_graphic_novel_free.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_off00006e43.bin
35b409658c89f7fcde06cbff4fe8394e82c82e8869997edfe387239fa9533724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E43 5344 bytes
font_01_sfnt_off0000804f.bin
6151e84b17d7593608327a677ea908eb99bd9e2541a86834f41b39e6a60dbccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804F 10836 bytes

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