Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13aa8df087e2f10…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 13:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08b531aaa9490ebd00f18a4467ddb2fe SHA-1: e4014744390e34b9d982297b8cffcfe838cd9640 SHA-256: c13aa8df087e2f104b0c401649ae539f9844a020938de20c1f510432585f3dcf
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to 'assassins creed black flag apk hack'. This suggests a phishing or malware distribution attempt. The PDF also hosts a large number of other links, many pointing to Shopify, which is characteristic of SEO link farms used to boost search rankings for malicious content. 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.com/pify?keyword=assassins+creed+black+flag+apk+hack
    • http://rogasat.firstresponsetraininggroup.com/uploads/1/3/0/7/130776445/f36d08716ef.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/british_council_ielts_reading_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/gutachten_bachelorarbeit.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/pdf_calendario_serie_a_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8975/files/listado_de_paises_y_capitales_del_mundo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/essential_adventure_time_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/69009085450.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/another_word_for_worth.pdf
    • https://cdn.shopify.com/s/files/1/0439/2399/6840/files/95185902107.pdf
    • https://cdn.shopify.com/s/files/1/0448/2924/5600/files/curriculum_design_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/8180774641.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/jomazidagakaritosemizuneg.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_off00005d3d.bin
5d0fb8fe9bd4bd354b842ea5db084fd2c4c61abe7ef7f11ee02a2ddb79ec6dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3D 5612 bytes
font_01_sfnt_off0000703e.bin
48221de45b5d313de9e699abfaa203a138b05151e16a2cb01fb230cd9f3345f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x703E 14672 bytes