Malicious PDF — malware analysis report

Static analysis result for SHA-256 b678aed9a02061f3…

MALICIOUS

PDF

54.1 KB Created: 2020-08-09 19:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5d9443f3b7487fd297ccfab0280bbe SHA-1: cac68f0a270f45907732c070de4f77be4d831f46 SHA-256: b678aed9a02061f372b0eeed8828297dbabed33f63ceb974621cda2714eec35b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, includes the same URL and text related to decision-making, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The presence of numerous links hosted on Shopify, some confirmed benign, suggests an attempt to blend malicious links with legitimate ones.

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/pify?keyword=toma+de+decisiones+bajo+certidumbre+incertidumbre+y+riesgo+pdf
    • http://rukalebu.mcdanielschoollibrarianship.com/uploads/1/3/0/8/130814328/sanije-taxajubosil-rujokomapigojog.pdf
    • http://files.cwcmontclair.com/uploads/1/3/1/8/131871466/1893165.pdf
    • http://files.dobermandiversityproject.de/uploads/1/3/1/4/131453365/tegegafume.pdf
    • http://files.sandart.events/uploads/1/3/1/8/131871821/5414ea7e.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/nawufidoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/97245216043.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/luxisuwawox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/piwebijeke.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/bawapotomunufovujosewe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/wuwudesakobisasolidigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0990/files/32213710377.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/obituary_writing.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/ielts_academic_writing_task_1_sample_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/28610965148.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_off00008306.bin
0a660b66d5133b237e0b76ab80f7160d5f2f3b6a9f4d9f380bed66c1ff054a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8306 5592 bytes
font_01_sfnt_off000095f9.bin
1ff863fd2c52b9f4dd83712cd1bb163a9ea3342ee390b7f8bb06e1a708fecf2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F9 11184 bytes
font_02_sfnt_off0000ba40.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 4324 bytes

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