Malicious PDF — malware analysis report

Static analysis result for SHA-256 077cbe0bfc9ae607…

MALICIOUS

PDF

44.6 KB Created: 2020-08-22 10:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82dc19389901c19f0460e585a5715312 SHA-1: 870c9d9c4168a413334081ef8a37d6585b774878 SHA-256: 077cbe0bfc9ae60748cdac23ac007bf2089f879480aaddff57d51752bf4cd934
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to trick the user into installing potentially malicious software. It also contains a link to a known malicious redirector, ttraff.com, which is likely used to host or serve the final payload. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute content via multiple links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=android+studio+install+emulator+mac
    • http://files.cordeliabradby.com/uploads/1/3/0/7/130775980/23ad1f67a6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/gibekipobuzuzenuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8563/files/free_english_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9751/files/define_balance_sheet_in_simple_words.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/36992648204.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/25035655528.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/gta_5_hot_coffee.pdf
    • https://cdn.shopify.com/s/files/1/0428/6749/0975/files/jupulipelefijegisituvi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/hotel_food_and_beverage_manager_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/32979351510.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_off00006fde.bin
faa61be18f2a50cd83b8e814bc8f7dcba4c87ccd86065a1de1e9b43f6df2cdf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 5072 bytes
font_01_sfnt_off000080ff.bin
03575e51d7fd7e7777c6badf4fd30acbe059ab3eeacba01888d654a26bc1bdb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FF 11512 bytes