Malicious PDF — malware analysis report

Static analysis result for SHA-256 7328e50dcf528f42…

MALICIOUS

PDF

40.4 KB Created: 2020-08-06 09:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c21f8b3619b6acf59165b6c68e75f727 SHA-1: eeb7dfeb929c0650304ec62c862038bc2dbf77dc SHA-256: 7328e50dcf528f42970dc5a43f82536db988c327a997e3b155651eeea9e12cba
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the presence of numerous links points to a phishing or malware distribution attempt.

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/pify?keyword=cantaloupe+island+drums+pdf
    • http://files.crossfit-galveston.com/uploads/1/3/1/8/131872238/xogururu.pdf
    • http://files.taurimufarm.net/uploads/1/3/1/4/131437980/270001.pdf
    • http://files.themistressclaudia.com/uploads/1/3/1/0/131069819/mivabovax-wipuzilowogibub.pdf
    • http://files.teresamagana.com/uploads/1/3/1/3/131381480/0335183a6bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62856854762.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/lisa_kleypas_hathaway_series_epub.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/cub_cadet_xt1_46_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/19950977897.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/bsf_recruitment_2020_notification_download.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/sq11_mini_camera_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/62435188954.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/article_about_english_education.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/27945571243.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/jigizen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/72560095586.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/letelagatedelususudo.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_off000060d4.bin
80191d07a7b0f46b5080216b0bf7b3e486b060c51b65a3635146e5aeb4d0d45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 5092 bytes
font_01_sfnt_off00007205.bin
6055950026f69ed0266b031269d687ebfe11de35521ec51f51802ad0a50e0c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7205 10188 bytes

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