Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf50be1d78d11db6…

MALICIOUS

PDF

40.7 KB Created: 2020-10-15 09:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: e9ef4fc94c621190c42a8dfd19dd722b SHA-1: 6d8860a48a3f31a574544aedf83baf9f28daf25b SHA-256: bf50be1d78d11db6e75788b3734dce8a9d9355cc94c231d8a2109eb44f492586
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://ggtraff.ru/strik?keyword=scratch+shooting+game+tutorial+pdf In PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/gijajetajofexuz.pdfIn PDF document text
    • https://site-1040669.mozfiles.com/files/1040669/67825045632.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/48543405950.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/pexogerakajuvin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f87e41355344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f87dd398dce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f86f5af2306c.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/1/0437/1909/8523/files/saavn_pro_cracked_apk_6.0.6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6080/4770/files/nekiguluxapisojibulajux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/76029132311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8966/9533/files/vutuxut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8409/6700/files/dusotawexavovibak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7724/8192/files/latexekumikar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bf0a28-4304-46eb-8295-f6451ee724dc/63115175710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a476f88-cc8f-4516-b57b-99b257e303b2/purapilaked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0ef9db-2fc0-4c55-af13-5053091a0fee/96469373621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b40f15-fbe5-4ede-97b0-1ffabf6114f3/17048110805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/86398762938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6978/7300/files/gafemenepazutitafukuvuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6690/8065/files/mogavezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6367/1454/files/tadizejenepiforuribed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/mass_and_volume_calculator.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_off000057af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57AF 5672 bytes
SHA-256: b230e1f10d5fea3bf00112d3b30658472285e9df9c8a6ad11a5ef1995a4a4691
font_01_sfnt_off00006abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABD 13396 bytes
SHA-256: 01f71079695e63fc35cefb0e9d411c8b9b7db7d4db5e2fee617375dc262cea10