Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f66d654f17d396a…

MALICIOUS

PDF

36.6 KB Created: 2020-09-16 19:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 491aadd383ce4136632bcacb5e2c2253 SHA-1: 2e4d2c90172b307ac26f54c621ec27aabc2e0f42 SHA-256: 0f66d654f17d396a578c0aa5abd2219713ed83ccbb74b3aa0e644baf92a58228
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, disguised with a search query. The document body, though heavily obfuscated, contains the same malicious URL and other URLs that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.link/wix?keyword=black+devil+cigarettes+near+me
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://844eaa88-7f9a-4f3b-9c5b-a59da26cf880.filesusr.com/ugd/469aea_6a79d5a28b6b42e4be21db6523f28f61.pdf?index=true
    • https://603c4a1f-2ce0-492b-a0f8-107e765ceadd.filesusr.com/ugd/136d3d_c4c55c50763047ab89d29a4c8d815fd2.pdf?index=true
    • https://fec15ea4-fa4b-4624-bc4a-98aa367d6ff3.filesusr.com/ugd/86319b_858356a442744076a107fd9cd1f44b5f.pdf?index=true
    • https://3e093cb4-1217-4d7e-b27e-6d6b52ed13f8.filesusr.com/ugd/8a05ec_887dea61cc05409dbc317556163a9e2c.pdf?index=true
    • https://07e0f4a9-015a-458e-8ed6-c2d89796a313.filesusr.com/ugd/a4ea6c_7a1732981a5747b8ad0848b4707cd7e3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/1555328080.pdf
    • https://cdn.shopify.com/s/files/1/0435/5683/1395/files/15900424651.pdf
    • https://cdn.shopify.com/s/files/1/0434/9729/1942/files/inference_worksheets_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/africa_countries_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/esl_adjectives_to_describe_food.pdf
    • https://cdn.shopify.com/s/files/1/0449/5153/5771/files/transformers_bumblebee_movie_optimus_prime_toy.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0741/files/30418620945.pdf
    • https://cdn.shopify.com/s/files/1/0458/1258/0518/files/20389095188.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ffa.bin
7cc1b44abf1418f471e0e8f4c9dd64b5fdd2c4a88b6cf8c9e7e4e789399ed2ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFA 5432 bytes
font_01_sfnt_off0000626c.bin
84577dcf21de2f272f175d9fe954d3e77467346cad3a00bdecedc1056e1fd2c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 10380 bytes