Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b200d45a11a99f2…

MALICIOUS

PDF

56.9 KB Created: 2020-08-30 09:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f5c38204ae3e73a37d5f5cc9fe7387 SHA-1: 769b78bf0281c21094c3fa65806ee8b499ac0645 SHA-256: 5b200d45a11a99f23c07512cbfac1504db191733c83fdbc19fe241845d06f5b3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=earthbound+zero+guide+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many pointing to benign content but likely serving as a distraction or part of a larger SEO poisoning scheme. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true purpose.

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=earthbound+zero+guide+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_614dab093aae428c81c5799293fc0278.pdf
    • https://static.usrfiles.com/ugd/63022f_110c9163a3df403ba5300004d4c7e572.pdf
    • https://static.usrfiles.com/ugd/544c7e_a89590cf5ed04f9db54448173566edd0.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/vovepumupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/bbc_learning_english_better_speaking.pdf
    • https://cdn.shopify.com/s/files/1/0465/9580/1253/files/iq_test_questions_and_answers_for_interview.pdf
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/19423315838.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/99901723753.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/notubusaxas.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/xufivonafunilez.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_off0000a1e6.bin
c8a80b03c0a7b5dc40d5648ef63170698fed14e0e03e2074cbbec5dad564ee1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E6 5240 bytes
font_01_sfnt_off0000b3bd.bin
7b537ed38b12a7bc6fc84eea47c0e73f0387603ba21eaa01b2ecaed848e8dab4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 10364 bytes