Malicious PDF — malware analysis report

Static analysis result for SHA-256 98aa764e8d8beaa2…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 09:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8354aac1d289a96173a00880dd3318a SHA-1: 0acd843c0cdcecb2508dba9d29b9bb7b1387f399 SHA-256: 98aa764e8d8beaa23446c87173b322efca5342337aeebef3649c2b00a6c6af49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=descargar+musica+para+usb'. This URL is presented within the document body, disguised as a music download link, indicating a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to manipulate search engine results or distribute content across multiple domains. The ML classifier strongly flagged this PDF as malicious.

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=descargar+musica+para+usb
    • https://static.usrfiles.com/ugd/9ff9b8_ca1411986aac4bd286a0edd80edc32f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f003ca53d3e84416b39c0544f18ba95a.pdf
    • https://static.usrfiles.com/ugd/585b1d_ee81c6383c7444929d38cd2e53b16f9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ce5c42005af4c70bb00e2326beefddc.pdf
    • https://cdn.shopify.com/s/files/1/0450/4656/2966/files/high_school_english_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7358/files/cours_anglais_niveau_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/63434726818.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/pieces_de_la_maison_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0448/6764/9698/files/ielts_academic_writing_topics.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/singular_and_plural_nouns_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3881/0023/files/semoxafumunofawawikafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7682/files/kojetimoruxuvi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/88541185154.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1080/files/79654558385.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a5f1c605a6426e87f9e7d95393b706.pdf
    • https://static.usrfiles.com/ugd/8acad3_07d63be7b4c042bea73207ed83a400dd.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071c0.bin
bc753018589299091fbed5dd6ffe6ac33bc6815efeb623add344de62a6614247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 5360 bytes
font_01_sfnt_off000083e1.bin
a5e01633a4957baf3c5301e819bc755dc96985108a8451aabb60f7ca76ac61f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 11648 bytes

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