Malicious PDF — malware analysis report

Static analysis result for SHA-256 a735e937c6be08dc…

MALICIOUS

PDF

64.1 KB Created: 2020-10-15 11:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ada9f7f6419545c5e44bdc191fab9c10 SHA-1: 575f3cdbd6bdefb531f29d6b90054559a00cf48b SHA-256: a735e937c6be08dc395b8a610190c3e58b6e74cbe87a4dd68c4e6a0e3808f051
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=performance+appraisal+and+employee+productivity+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f8753fbf01d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f87092ca0179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f87b6bac6db1.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/jibitut.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/50595819802.pdfIn PDF document text
    • https://site-1039902.mozfiles.com/files/1039902/52602202741.pdfIn PDF document text
    • https://site-1039491.mozfiles.com/files/1039491/64880351496.pdfIn PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/deleduvinewowed.pdfIn PDF document text
    • https://site-1042101.mozfiles.com/files/1042101/53385916488.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/1/0496/7707/4585/files/sugekefili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3697/3983/files/dafowikorutipigamizofitok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1296/4519/files/fozinofepom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4947/2159/files/fomuruporoxalijowejinuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7248/6076/files/south_park_video_game_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9fff10-a074-45f3-89b1-0e6a66d8b4d2/vogixinedudelexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733caf3b-c5c9-4443-aea5-621553fa28b1/ropawopupupivaroxinanad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8f9381-785e-4d60-a9b8-43ec92874a12/vuzazelujuwuwujarekonarip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9948/0998/files/rubbermaid_servin_saver_4_lid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1291/7912/files/what_is_a_crescendo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9957/3410/files/lulubox_apk_download_free_fire_hack_diamonds_and_coins.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/xurudalavo.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_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 5464 bytes
SHA-256: 25b06343fd31bcbdd41c09cf3857808018249ea2fccd1402615f7c5ac8db8b61
font_01_sfnt_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 10272 bytes
SHA-256: 8da4b81d83137688522e6c3e37de7dc652607975e9ac87c471afce8c9587301e