Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09a2b1eb0311d5e…

MALICIOUS

PDF

44.8 KB Created: 2020-11-05 11:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4fa80fbb85677e28175717acf5c3b15a SHA-1: 8f107f2e0309248145bf0040b33fca590bd8c517 SHA-256: c09a2b1eb0311d5ea16d81859691f3eca120bd7984192111cf768cb44edc6148
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/aws?keyword=graphing+exponential+functions+worksheet+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link indicate an attempt to lure the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=graphing+exponential+functions+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f9d41efde51f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5fa2de3753403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/najubu/laxefilu.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/ispring_rcc7ak_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653b46a2-208b-4db8-af02-a7eca5de42e5/32699197674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca65dae-b271-440f-8529-963f48301ddf/jujujexew.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/6_speed_getrag_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/zoe_pound_hipwiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b26503-ec10-42f2-b909-0834462e170b/dasidosafasijotapepusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3888/9891/files/92623764269.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5322 3120 bytes
SHA-256: 4925a81319bbd9efa0dcb9b7c66fccd1fd8c2b9f5e9916edfa1d670e4d491518
font_01_sfnt_off00005e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E57 5556 bytes
SHA-256: d4d9ce2555ca0afd27f03fdb3db92719ca5d4da3d02d7db258f75f65135e1d05
font_02_sfnt_off0000714f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714F 11244 bytes
SHA-256: 06685c120de55bba80ece092ca961499484afae34ec556f4770bc93816e14311
font_03_sfnt_off000097af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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