Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db0ef8816ecbf98…

MALICIOUS

PDF

60.0 KB Created: 2020-08-30 17:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 423f28e65ed265e673da67251e74c931 SHA-1: d23853a7e20b2b4237209aea470801b423baf1e6 SHA-256: 0db0ef8816ecbf98d9f6150641d0002e089cc1ddde1a0443a5477d5fd0367101
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=medidores+de+flujo+volumetrico'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination. The ML classifier also 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=medidores+de+flujo+volumetrico
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/elite_dangerous_horizons_mining_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/vce_general_maths_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/simple_recommendation_letter_sample.pdf
    • https://static.usrfiles.com/ugd/b8c837_11aa4c9333a142c0af0c7741f0e27970.pdf
    • https://static.usrfiles.com/ugd/374ce0_53760700f45d466dbf3fb5a8cbd57d35.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf567948d778449dadfef72b0fab2175.pdf
    • https://static.usrfiles.com/ugd/97368a_aea9713bd1a04f37b7eff0dfab65e175.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8f7d119cd7a4af69d3d0cf4b5e29ad9.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/clasificacion_de_los_animales_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/warehouse_management_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/sobuzosa.pdf
    • https://cdn.shopify.com/s/files/1/0462/2440/8730/files/holes_anatomy_and_physiology_15th_edition_apa_citation.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/bluestone_alley_piano_sheet_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7160/files/muxeza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/43787003839.pdf
    • https://cdn.shopify.com/s/files/1/0461/7260/2531/files/girls_do_porn_e498.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/bangla_computer_book_free_download.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088ae.bin
f64f1fc9035b084a69fe4465da43c356af326072d00d84d19ecafe6bd60a6006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AE 5096 bytes
font_01_sfnt_off000099f7.bin
6b27199fbcb7c590e2cc9f77dca819bb73d5398db59d8bcbf23113622346793d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F7 2628 bytes
font_02_sfnt_off0000a521.bin
48af6998f4c6d548f00eca15b648879991ee76f8d408c41d7322296b6322acc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA521 11312 bytes
font_03_sfnt_off0000c9dc.bin
9b35cbe2e4085b086d1b81269a7116302f8febe3dc8de83c2fb7ea9a4ef94b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 16512 bytes

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