Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea53d54b8afe41a0…

MALICIOUS

PDF

39.2 KB Created: 2020-10-26 23:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f11a2007d3c53b6ddb4cd89a49bfd86 SHA-1: 9f8e816b5569000d385c5ceebd9acb458eb7780f SHA-256: ea53d54b8afe41a0c402b72521a592a0c955c6c9cea295ee0dab251f8c6e5cd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'worksheet'. The presence of many external links, including a large number of PDFs hosted on strikinglycdn.com, indicates a potential link farm or SEO manipulation tactic to distribute 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/123?keyword=predicting+products+of+chemical+reactions+worksheet+2
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/4066738.pdf
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/9905354.pdf
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/wiramesux-gokunepos-luzodaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/257e0c6b-35ff-459e-8aa2-64e9d6b5d7c3/xigekibagavoduka.pdf
    • https://uploads.strikinglycdn.com/files/f9417bb0-7375-472f-b716-a0d176f863b4/53326407675.pdf
    • https://uploads.strikinglycdn.com/files/bcfe915c-ef15-436c-bd5b-6a72ead045e5/ramofu.pdf
    • https://uploads.strikinglycdn.com/files/ab13fe57-b0e5-4668-80fb-0dcea5be2bd5/ejercicios_de_word_avanzado_2016.pdf
    • https://uploads.strikinglycdn.com/files/6a183218-fb50-4ffc-bdfc-9d4bf519906d/90338170971.pdf
    • https://uploads.strikinglycdn.com/files/d8a7cd9d-5791-42cd-a305-6534adbd7d5d/voxidobodobezaxalosomir.pdf
    • https://uploads.strikinglycdn.com/files/bcb4f02c-dca0-4de9-940c-0076c7e2c179/83689507478.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/68423255273.pdf
    • https://cdn.shopify.com/s/files/1/0503/3659/6131/files/android_recovery_software_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/15042204139.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/55588181023.pdf
    • https://uploads.strikinglycdn.com/files/76d77b06-8648-44c8-8223-9fc32efe7640/koxemipejonowuvugidepag.pdf
    • https://uploads.strikinglycdn.com/files/cee1f4e7-76b9-4348-8fff-8a1bcf8b23eb/vodekugegililenuj.pdf
    • https://uploads.strikinglycdn.com/files/918803c1-fb30-447e-be2b-5cb3ce685afa/gotuxavuxowirekasogew.pdf
    • https://uploads.strikinglycdn.com/files/7ab0ad24-7ac5-4844-9d80-abdfe07e2aa7/tasilibojuditasenuzekibe.pdf
    • https://uploads.strikinglycdn.com/files/03a76d43-3cd3-4b55-ba71-a4d415641091/77340628960.pdf
    • https://uploads.strikinglycdn.com/files/c5f188ad-7a16-407c-a6b7-e725ba194a5e/biwibatinapefidunatumij.pdf
    • https://uploads.strikinglycdn.com/files/d5f8c9ab-1aaf-4b77-a747-2ed71d5424cc/current_voltage_and_resistance_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/6d70fca6-b71b-4cc4-82ca-698fe5e105a0/dakepekisaboj.pdf
    • https://uploads.strikinglycdn.com/files/132052cb-35ee-4357-9898-07204440e42a/89360433605.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053db.bin
c2b2c1f7f26ca4d4392734f81c37fe98811675caf1bb41a4b1fc2d2823c18657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53DB 5860 bytes
font_01_sfnt_off000067a6.bin
0902f29f6fc958b8973a1a70595e731a5ee28a069ca89862fc4e242ca4caa1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A6 12080 bytes

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