Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7d8fd4bdaff410…

MALICIOUS

PDF

41.9 KB Created: 2020-11-01 11:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 91c25d24fd2ef32841672de7f91b2bb4 SHA-1: 903945a98ee58c8cdc585f2e9acbf285d398851b SHA-256: 3d7d8fd4bdaff410f5d3c115ada4770e30589c646731ea7d910d2ac952d6180b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for academic content, specifically mentioning 'ray notgrass american history answer key pdf'. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to a malicious site.

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://ggtraff.ru/aws?keyword=ray+notgrass+american+history+answer+key+pdf In PDF document text
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/zuzijiba-lasemudukufe-tofiwasopesukus-nusokola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f9d49fc70c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f92c46f6d899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f9af459a5e80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8540/7408/files/adding_subtracting_multiplying_and_dividing_negative_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0f21d7-7ba5-4abc-a76b-307c35ee38e7/44032747801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0554/2051/files/gospodarka_niemiec_eugeniusz_gostomski.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1556/7035/files/talegim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/500_writing_prompts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8460/2262/files/alphasmart_neo_2_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/android_oreo_go_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5749/5197/files/kon_tiki_libro.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6290 5800 bytes
SHA-256: 44b7fae5263f02b021529ffc1527ae00f1d7a28fc18281ec49b28c4a81c0ab31
font_01_sfnt_off00007652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7652 10552 bytes
SHA-256: 59483b33a7af5387e1d6bf5b6221bbf62d306ba2a9719988025cadcb9f3c31f4

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