Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f96399ffd65d5b…

MALICIOUS

PDF

41.4 KB Created: 2020-10-26 10:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1bdbacf2073c46e56ff37b1da0dfc61 SHA-1: 9505f66d57ab5c7687866329441f4afd9bed5331 SHA-256: c5f96399ffd65d5bf1fed3311121676fec364f6fe808ebcff69c9eb7002b6910
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains the URL 'https://ggtraff.ru/123?keyword=tumores+renales+pdf+seram', which is flagged as malicious. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites.

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/123?keyword=tumores+renales+pdf+seram
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.pdf
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/7ab649c307f4d.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdf
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f89ec67da119.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f96360a07ad4.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f95f7761a705.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f8ca1a51ab27.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f8a46fcf1c75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sisaxu/farm_machinery_design_book.pdf
    • https://s3.amazonaws.com/bakoloj/angels_in_america_millennium_approaches_script.pdf
    • https://s3.amazonaws.com/subud/beethoven_piano_sonata_no_5.pdf
    • https://cdn.shopify.com/s/files/1/0492/4529/0652/files/nanaxabuxukowipage.pdf
    • https://cdn.shopify.com/s/files/1/0493/7108/7007/files/fugotevowovozolijukisilo.pdf
    • https://cdn.shopify.com/s/files/1/0495/1395/5496/files/batudiv.pdf
    • https://cdn.shopify.com/s/files/1/0504/0852/1902/files/drawable_circle_button_android.pdf
    • https://cdn.shopify.com/s/files/1/0490/6414/9168/files/52197093750.pdf
    • https://cdn.shopify.com/s/files/1/0505/3045/1628/files/viking_gas_stove_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/fabius_plus_xl.pdf
    • https://cdn.shopify.com/s/files/1/0496/2297/4627/files/13820204021.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/carnival_of_venice_trumpet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0497/4195/5221/files/wifed.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/la_marzocco_linea_pb_3_group_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006104.bin
44cd9cb46d67056312db6faa4c717255fa46b139b296a4299ec74b9ad2996782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 5136 bytes
font_01_sfnt_off00007263.bin
c784e0a68f323dfa90065d74395676f004a9026cf1cecee8c1118ba53ebf3010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 11148 bytes

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