Malicious PDF — malware analysis report

Static analysis result for SHA-256 983bb3bb7a1b5ec8…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 03:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 336a26c511e8023986e3e3b515110571 SHA-1: 042caf8f5c482bba178410e9cf1efef4a2aedaa4 SHA-256: 983bb3bb7a1b5ec81e8084642d521ee395f9cc8272d44a3c62a788bcf9535034
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'absolute value inequalities worksheet algebra 2 answers', suggesting a lure for educational content. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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/wb?keyword=absolute%20value%20inequalities%20worksheet%20algebra%202%20answers
    • http://mofuso.alvaroantona-flamenco.com/uploads/1/3/1/3/131398367/6884449.pdf
    • http://files.wendywangauthor.com/uploads/1/3/1/4/131454297/wagafo.pdf
    • http://farunipig.nwsslivestock.com/uploads/1/3/1/4/131437812/afa34df6c46c.pdf
    • http://files.whisperingpinesfarmpa.com/uploads/1/3/0/9/130969270/9875650.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/zisopowugasolejon.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/ielts_writing_task_1_academic_answer_sheet_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/kegimozasugamosebave.pdf
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/crack__abbyy_transformer_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4458/6140/files/79421290094.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/tuniluzas.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/dissertation_acknowledgements_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/50596009397.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/61074545672.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/landscape_photography_settings.pdf
    • https://cdn.shopify.com/s/files/1/0452/0319/4007/files/32936968278.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_off00006252.bin
5008bea6216498dae7d357c1c4bee7dcf5f6ef2fb4a7a3ed2d8b0de856fc56d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6252 5552 bytes
font_01_sfnt_off00007538.bin
57155263b39844b6c2cf28e92ec1820246022ce3891162c4bc67e8433017b35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7538 10708 bytes

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