Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcc993a37f9779f…

MALICIOUS

PDF

69.3 KB Created: 2020-12-07 23:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 12cfe8b369cb841cf6c65594d2ec44c9 SHA-1: ba130f9c992f058a8151decc33b53f00b76e4bef SHA-256: 1dcc993a37f9779fe2acc8475033d0747c31eca0cc1c7e9c0d05ad32ae2b0f25
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of links to other PDFs, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of malicious links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=lowes+community+grants In PDF document text
    • https://runolenasugu.weebly.com/uploads/1/3/4/7/134765044/nukeforibapeto.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/3381808c38f4.pdfIn PDF document text
    • https://bawimivumo.weebly.com/uploads/1/3/4/6/134609907/f7dae2bb1e0940c.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/8152184.pdfIn PDF document text
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/fapifolekoxi_wotoxuxivofadak_fubuw_podudusezab.pdfIn PDF document text
    • https://sorefikope.weebly.com/uploads/1/3/4/6/134664591/2882326.pdfIn PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/95e3c42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zizene/xerufapuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/guzheng_see_you_again_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/memazeku.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/fourth_grade_math_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/matlab_for_engineers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/92258744718.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/baahubali_1_malayalam_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/nulipebipoxuwoxukupugibej.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_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 5224 bytes
SHA-256: 79e727974576044dea8041330552f3c17033b0574b47c2d345adf5ba778c7870
font_01_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 11260 bytes
SHA-256: 1d2373ef80851ffe6c77e2e8432e2fbcb16f0c32afe9ec2a7b7d643ba1de1983

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