Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1979fa8f1fbc649…

MALICIOUS

PDF

46.4 KB Created: 2020-11-01 08:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2857035d7b008a1096daa1ed43b211a1 SHA-1: 06f6d3e8f87969681cf05234b541626938f3912b SHA-256: c1979fa8f1fbc6495fdce13cd7d2fdc4acc5784001f75de787f96dbc1b1d2b29
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a potential attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.link/pify?keyword=caracteristicas+de+una+base+de+datos+en+informatica In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f8d373977235.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://uploads.strikinglycdn.com/files/3897cba3-db47-42c5-95af-36da5eda81fd/68439639014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5312/5284/files/push_pull_workout_for_mass.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8042/6671/files/asian_date_hacked_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0510/2351/1717/files/oa_ow_worksheets_2nd_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0435/2423/files/forewedekenojatefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/samsung_android_10_support_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1708/3286/files/69178603701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3478/6971/files/minivaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8434/1950/files/iowa_high_school_wrestling_tournament_2020_watch_live.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4999/6447/files/l2_network_engineer_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6298/3363/files/sigetedinifevuxezanef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8651/0748/files/bonawiwelepaxegemoveximam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6830 5180 bytes
SHA-256: 8376a8351d5199d377f499e083d3847c764965ee32785010a06281c149fe657f
font_01_sfnt_off000079b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B0 10756 bytes
SHA-256: ae94200bfd48b0229091c80d28c4ace529ccf1cb1548b95936fb8958d2897a52
font_02_sfnt_off00009ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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