Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b355e94b3584a1…

MALICIOUS

PDF

45.1 KB Created: 2020-10-29 07:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed504a436a3c7fadd4344e16c531bd8c SHA-1: 1c1a27f519342dc4e7b34afc91db684b73c4d574 SHA-256: c5b355e94b3584a152661041f721b15781c534e787230b14ba786462a356d4a9
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The primary redirector URL is 'https://cctraff.ru/pify?keyword=the+12+week+year+book+pdf', which is likely used to funnel victims to phishing sites or download further malware. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure.

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/pify?keyword=the+12+week+year+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_5f982d6f27fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5f8eea071da45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f98f444ca02e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f961291b19be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f872cdd359d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f94ff3687d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_5f99d70951b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f8fc9cd3fb5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f87f6d9c4b41.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/1/0486/1604/6752/files/acer_aspire_tc-605_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec6ce57-22b8-4b06-aaed-faeb649e9c7e/6321176525.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/clash_of_clans_th7_army_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ca6260-e27e-45f8-9d40-9ce33bc870ce/35031963791.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/79150346423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3421/8133/files/79213782900.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/tales_of_symphonia_tech_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/26908717198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9471/1705/files/8779201760.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/lejava.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/rental_agreement_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/anova_one_way.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f911dc-e5ae-4710-9c49-6f3793cfc7af/78239679628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee74cfcd-c60b-4b64-9420-e6dcdd1b93e8/gapobebas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9230/1718/files/when_we_ruled_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/false_cognates_list_english_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6953d813-fc85-4ffa-973c-4c368e63c383/sisoj.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_off00007039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7039 5452 bytes
SHA-256: d2f60cfc84c8f9dc007c84d74cd226ea3f4a7f55925a3089c64d255501b72ce7
font_01_sfnt_off000082d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D6 10660 bytes
SHA-256: 1907a66a54a87d0ab2c16ee83e9e6ec00731328fa493316be4c971f55840aca5