Malicious PDF — malware analysis report

Static analysis result for SHA-256 b067d56e2b9c272e…

MALICIOUS

PDF

45.9 KB Created: 2020-08-21 01:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efab09dfdf0ff0ac2d2348ad2ef7bffe SHA-1: 319b4a7916f0fa789ec8249f4c00684d5ce0a331 SHA-256: b067d56e2b9c272e66442fe6ad36d34508350d601045c3dfe2902588286323e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at `ttraff.cc`. The document body, though heavily obfuscated, contains the URL `https://ttraff.cc/pify?keyword=medians+centroids+altitudes+of+a+triangles+answers`, suggesting a lure related to academic topics to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=medians+centroids+altitudes+of+a+triangles+answers
    • http://files.pomphreyconsulting.com/uploads/1/3/0/7/130775286/f6547ee.pdf
    • http://files.melissacharlesart.com/uploads/1/3/1/3/131379409/407cdc6e15.pdf
    • http://files.ascott-education.com/uploads/1/3/0/8/130814308/8ad5ae162ec4e.pdf
    • http://files.recorderstands.com/uploads/1/3/1/6/131606467/5092390.pdf
    • https://cdn.shopify.com/s/files/1/0435/6902/1089/files/18160215092.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/dagulugilapujis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/vubewudox.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/catia_v5_full_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9767/0303/files/retinosis_pigmentaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/ginoporesuvegijamogatafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5032/8486/files/serie_a_calendario_maro.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/html_template_material_design.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/postur_apbn_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/unworthy_of_your_love_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/aviso_de_privacidad_banamex.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/xetiwolatupuduzo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ef.bin
85daa86e89aee5ed0a9c0220f57f99c74401d044365d332e88bb71d8410a268c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EF 5284 bytes
font_01_sfnt_off00007309.bin
23d4b6ad0dc156cfda70643e36bf59823b483bae604af9309cf9abe22c7264ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7309 10108 bytes
font_02_sfnt_off0000959f.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959F 16072 bytes

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