Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4af4c995d7b496…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 04:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98c19895314b640a65cb609a18cf6bc7 SHA-1: d923d69e26794a721d6b5434fff9032626bb2341 SHA-256: 7e4af4c995d7b4966963089758a656d068a5b9dce529fa5278687ba1fd8c04e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to other sites. One of these links, https://ttraff.cc/pify?keyword=free+year+5+english+worksheets+uk, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs, suggesting an attempt to trick users into visiting potentially harmful websites.

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.cc/pify?keyword=free+year+5+english+worksheets+uk
    • http://files.arshadsaeed.com/uploads/1/3/0/8/130813528/dfca2e0f1c8023c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/d_d_5e_bard_spells.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/bhagavad_gita_chapter_1_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/800_thread_count_egyptian_cotton_percale_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/soburaki.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/hennessy_patterson_computer_architecture_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/duxenatenawer.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/wegoninulexaxovup.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/53066480663.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/pabuzitave.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/zalozole.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/ligamimisabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/tepobudataka.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_off00005cac.bin
67ae51a4aa07ed8e47a5b3f4cce8b2eb3d34d350acc3e975eb490202770f24b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 5284 bytes
font_01_sfnt_off00006ebe.bin
94a216555783393c624c3dd2aff1dfb4b59d6ba4579ca03aba3c5cff1ca2b5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBE 9888 bytes