Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d23b74c9c4e7b2…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 04:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40f2cb396ccc9fd028af58653bd2fd5c SHA-1: 6813384cb399422deaa40c7c5ec14b05e9f7eee8 SHA-256: 65d23b74c9c4e7b26ba33dff20ccac1a66d8a33287fd7a948735816fb0d073a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate PDF resources. These links ultimately redirect to a known malicious URL (https://ttraff.ru/pify?keyword=piramide+nutricional+vegana+pdf), indicating a phishing or redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=piramide+nutricional+vegana+pdf
    • http://files.christianleigh.co.uk/uploads/1/3/1/8/131871414/6128210.pdf
    • http://files.atlantaicedanceweekend.com/uploads/1/3/2/8/132814241/0fab84.pdf
    • http://widug.shouqalhudaif.com/uploads/1/3/1/4/131482995/nixifulukizezowojik.pdf
    • http://files.ericasclassroom.com/uploads/1/3/0/7/130738700/d6a84389fd975.pdf
    • http://files.humanresourcesolutionsllc.com/uploads/1/3/2/3/132303133/feduxemep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/wrightwood_ca_weather.pdf
    • https://cdn.shopify.com/s/files/1/0437/8843/5613/files/operational_amplifiers_theory_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/83324885060.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/consonants_sounds_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://cdn.shopify.com/s/files/1/0440/9756/8920/files/child_psychology_books_free_download_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/banting_green_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/91784189673.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/pabilatavudenuju.pdf
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/gafurusibuvoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2661/files/break_even_point_in_economics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/62762945365.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f40.bin
fffae5a10d4b622d10fb724920341b4da23b9cadc14cdde80d82811a1d1427e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F40 5360 bytes
font_01_sfnt_off0000715b.bin
fa836470b372d4c002ef8114088cca77ed9eb1608b18e3547acf174aed6e4b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715B 2016 bytes
font_02_sfnt_off00007ac0.bin
2f2dffc529601d10f56b6c920c7edb59bdba9e19de0c142a56fb5586e2b13b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 10036 bytes

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