Malicious PDF — malware analysis report

Static analysis result for SHA-256 19de0c069ec434e1…

MALICIOUS

PDF

52.0 KB Created: 2020-08-08 20:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1990e7856561b7f75c0de599e7ef09a4 SHA-1: 6cdde6295f93fbe572cd28a68585651b9adbffae SHA-256: 19de0c069ec434e1c747844d56d7726d6c22de6002540706d97d92667e741b94
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to obscure malicious content. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.com/pify?keyword=caballo+de+troya+pdf+6'. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, reinforcing the malicious intent.

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=caballo+de+troya+pdf+6
    • http://files.scsa-pa.org/uploads/1/3/1/8/131871568/aad90e1e629.pdf
    • http://files.historianchris.com/uploads/1/3/2/7/132710797/rewezifuva-tusakenodexedod-bonasaguxate-wotiwe.pdf
    • http://files.ruthmaryjohnson.com/uploads/1/3/1/6/131606291/sezevujatida.pdf
    • http://files.bect-services.com/uploads/1/3/1/4/131483440/rafipekupipugapabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8243/2160/files/juvitowajovodokoteguruli.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/critical_discourse_analysis_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/1503904349.pdf
    • https://cdn.shopify.com/s/files/1/0447/9172/6240/files/echo_cs_310_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/bezonuzimeropa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/alpha_bullet_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/enter_the_gungeon_meatbun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/88102269991.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/automation_testing_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/dipiremirod.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/gopitizevoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/gemipirun.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_off000089d8.bin
27c986cc7debb385b0d39b7b442540310da45e660d7cadd894e5661db68f6ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D8 5160 bytes
font_01_sfnt_off00009b74.bin
e27137a2b24bc0a420331d635e4a4367e5764f6cec162ad0a8a0bf4e5eac8c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B74 11780 bytes

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