Malicious PDF — malware analysis report

Static analysis result for SHA-256 7073dbd55acbd77a…

MALICIOUS

PDF

41.7 KB Created: 2020-09-01 04:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2faffd456c665eb02e968cb549dc792 SHA-1: 5cefc9e8c824032dc3f74607eecb093c410e8776 SHA-256: 7073dbd55acbd77afc20300a842037084b86e39089c00e051c277c5ef958ae5b
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 manipulate search engine results. One prominent URL, https://ttraff.ru/wix?keyword=deux+arabesques+sheet+music, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to sheet music and the URL, suggesting a lure to a malicious site. The ML classifier strongly indicates malicious intent.

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/wix?keyword=deux+arabesques+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_da29784fddc941709d1303eb22aad9c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b935660bb4b41b0a56ed5f44f4834f7.pdf
    • https://static.usrfiles.com/ugd/eaf48f_53c5e494f3ba4d889572d1f63d413780.pdf
    • https://static.usrfiles.com/ugd/0f5b72_8a8deb0b19b44a4fa4ccf17199e9b1ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_42a66ad919d34360ae6ce3c67c1ee1a9.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/22065846180.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/new_barbie_doll_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/19031312875.pdf
    • https://static.usrfiles.com/ugd/b91566_acc8f197a0cd41cd9a40e2ab3064301d.pdf
    • https://static.usrfiles.com/ugd/0adedf_2fb8a1402e7b4f1a82af726acbc947f1.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_9408bece01784ce5b636337b90481eaf.pdf
    • https://static.usrfiles.com/ugd/724bd4_a99413ed9c514685b6a62cba0a511a09.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/90837225201.pdf
    • https://cdn.shopify.com/s/files/1/0430/4188/2265/files/multiplying_polynomials_expressions_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/definitive_guide_to_retirement_incom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7013/files/basanti_dj_remix_song.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_off0000561d.bin
cffab162e9d306b6c9e6f4b398c7376ff21c7262152aee2d961f76ef1a55c63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561D 5340 bytes
font_01_sfnt_off0000682a.bin
a23403e1d1ff26b48c7a5350abfbc1806317320998fbcfd09acc85c16bc36542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 15392 bytes

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