Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd43f124501ec27…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 15:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efc4ed1c02b70ca0986f056393295174 SHA-1: a21504e4b0fb4c10980033c0876bd36d8815c17e SHA-256: 0bd43f124501ec27fac0e7cdd8fa863df0196338b3779b84f5e82441fc8b596f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text that appears to be a lure related to software specifications. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL confirms the intent to lead the user to a harmful site.

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.ru/pify?keyword=exemple+de+cahier+de+charge+d+un+logiciel+pdf
    • http://files.finneyart.org/uploads/1/3/2/6/132681772/raluwuritut_gerulufazatu_niwukemitaval_vafoluwevol.pdf
    • http://files.creativesoutherndesigns.com/uploads/1/3/1/4/131453106/7414298.pdf
    • http://files.btmamusic.com/uploads/1/3/0/7/130775448/7091750.pdf
    • http://files.ackthaihouse.com/uploads/1/3/0/7/130776641/18d590.pdf
    • http://files.vetmobileclinic.com/uploads/1/3/1/3/131398532/tabumokuwev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5320/3104/files/12036_windsor_moss_21042.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/40187236989.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/xiteso.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/93080944519.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/monophthong_and_diphthong.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/55624199604.pdf
    • https://cdn.shopify.com/s/files/1/0447/1701/5194/files/audiobooks_kodi_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/dexezuduwerawomogefek.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1298/files/bodies_by_rachel_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7887/7337/files/plural_of_cactus.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/17648098932.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/nevetuzaru.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_off00006194.bin
60c78901829ab024bea50d9f2201e2f003adcafcf635b9b20f0009198154be0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 5416 bytes
font_01_sfnt_off000073df.bin
580b6eddcd04eca0c7bc3c0f44526d16961aa350828fe4fa1ef6f45104c10d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 11808 bytes

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