Malicious PDF — malware analysis report

Static analysis result for SHA-256 739d3cd277cc2090…

MALICIOUS

PDF

54.4 KB Created: 2020-10-28 19:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7af5fc820915772db4f95f552cf71ec1 SHA-1: 9274fcb914248ce2c7f257098c860bfbf2b7f73f SHA-256: 739d3cd277cc2090091ed4e6aeff114ffe7b33c934d3b417679a23f18eb4b0db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to increase visibility and click-through rates. The ML classifier also 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://cctraff.ru/strik?keyword=kentucky+civil+war+battles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f8f18f0a3fb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f8da7a46539c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8aa392d79ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f98ab20e4d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8713e47f82c.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/1/0440/4169/9478/files/fubud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2693/5708/files/76509698192.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/xidaxovotevixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8878/2506/files/the_crucible_act_2_reading_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0855/6708/files/texizexufafego.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/ordering_decimals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/gukasetulogifav.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/carbonate_diagenesis.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/calendario_escolar_2018_y_2019_sep_195_dias.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/pokeone_battle_frontier_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9931/1268/files/java_lake_ny_weather.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3342/7619/files/72101911501.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/78072893081.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/68249000583.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/carboplatin_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/30382059064.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_off00009549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9549 5220 bytes
SHA-256: b7b8b71c36a93084744f15a8843fb4473182b2e8e25646ecc507be24db3fef3a
font_01_sfnt_off0000a73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA73A 11348 bytes
SHA-256: 4f0c4f6bd34e44e89973598a5afd69f39e03331782e2dfdef18daec81c36a2fe

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