Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc1acb45adb5da8…

MALICIOUS

PDF

52.8 KB Created: 2020-10-12 18:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 84056ae5d355ffd7cbcb46e53caffe16 SHA-1: 7fce89d44be38a373fe205eb16f75ddeaebb592f SHA-256: 8fc1acb45adb5da86ea60231cf30771e67a96f12665b2bc57b3ea616e43fed23
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=household+fuel+combustion+pdf In PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/47718406282.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/19228702191.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/pazinisojegikurasema.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/76783843851.pdfIn PDF document text
    • http://kixekuxu.sridevi.org/uploads/1/3/0/8/130814328/4893323.pdfIn PDF document text
    • http://files.ncexchangeclub.com/uploads/1/3/1/1/131164046/c2917.pdfIn PDF document text
    • http://lizanab.customhomemechanics.com/uploads/1/3/1/8/131856293/jiwekoxopefa_xetofudi_pamozazotem_jejojutasa.pdfIn PDF document text
    • http://files.trilogybookclub.com/uploads/1/3/1/3/131378952/2269488.pdfIn PDF document text
    • http://jozowuk.godservantcreations.com/uploads/1/3/0/7/130738482/5620613.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/1/0484/7088/4502/files/so_security_office_eugene_oregon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5898/9729/files/tascam_audio_interface_mixer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/9173/2127/files/prawn_suit_depth_module_mk1_location.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2305/5523/files/83718052884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4242/6017/files/thy_soul_shall_find_itself_alone_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1316/0350/files/estudio_en_blanco_y_negro_tema_principal.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F8 5188 bytes
SHA-256: c9b342e3264a360a65383f1d8186c118e088adfd804477839ad3896c498a1d7c
font_01_sfnt_off0000a27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA27B 10428 bytes
SHA-256: 0f9e4a7f1731d9baa8bf393805c62bba46b960a62f1c4bdaf01512ced8f1ab57

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