Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec3f3fcfab5a82e…

MALICIOUS

PDF

77.7 KB Created: 2020-10-02 16:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 62520b091645020e96207bf6c197cf34 SHA-1: 7a1a64299e916342fe04c3ba5a6f2d5f496e2952 SHA-256: 4ec3f3fcfab5a82edb8b68b006c3cd1e1a089c5a54d55cf9b978c93f56e99cf3
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm designed to distribute further malicious content. The presence of a 'download button' lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=durga+saptashati+marathi+pdf In PDF document text
    • http://files.limerickcommunitygrocery.com/uploads/1/3/1/3/131398164/vuwidalapaji-vezeli-sebunarididu-vinewijurat.pdfIn PDF document text
    • http://nosap.booksbyrjsimon.com/uploads/1/3/0/8/130874569/2755280.pdfIn PDF document text
    • http://xalegak.layagsug.com/uploads/1/3/2/6/132695601/1846340.pdfIn PDF document text
    • https://site-1039759.mozfiles.com/files/1039759/80312785723.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/digukegitoxusig.pdfIn PDF document text
    • https://site-1041854.mozfiles.com/files/1041854/8326422483.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/12540213900.pdfIn PDF document text
    • https://site-1038979.mozfiles.com/files/1038979/59776440106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5901/4551/files/is_the_arch_of_constantine_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5769/0277/files/54323327231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/map_of_colossae_laodicea_and_hierapolis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6329/5654/files/feedy.io_unblocked_games_66_at_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2780/7646/files/31253797564.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC00 5420 bytes
SHA-256: 88863a4c70686b3903481599b6f1107ccc9a2c946b20b3887aab40e08322956f
font_01_sfnt_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 3772 bytes
SHA-256: b9b49a3c453c53986d7a61d4291ac5a87065d82ff96be43ef0dca6427e6dc540
font_02_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 13576 bytes
SHA-256: 8ac8e1962ad8d473dbd04be35bef615af514265f526efaf754ef9a49f30c009f
font_03_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 11100 bytes
SHA-256: e7e9d959003906859bef93777c8b21086877dc26d58f9876327f454989c9ba70

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