Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f27e38f127485d4…

MALICIOUS

PDF

43.2 KB Created: 2020-10-10 13:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 88e692893c6d0fde65d5fd7e41174b28 SHA-1: f01ac5331b5aef738eea4b373a22b2282abd8581 SHA-256: 8f27e38f127485d4bba7557f3e75b89e67421077084a6ceca8b4282c3ca683b6
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/pify?keyword=solo+baric+l5+8 In PDF document text
    • http://kanev.totalmastersswimming.com/uploads/1/3/2/3/132302936/33f11e5d0.pdfIn PDF document text
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdfIn PDF document text
    • http://files.newdaychildrenscenter.com/uploads/1/3/0/7/130776001/fegaretet_ruzimofaluvizuj.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/1/0483/5681/9097/files/amplitude_period_phase_shift_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/vanagosunusixisawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6681/3337/files/indoor_humidity_gauges.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/spatial_organization_in_architecture_slideshare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/7907/4727/files/samsung_dishwasher_dw80k5050us.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/3137/8331/files/hernando_county_jail_arrest_records.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/manual_camera_app_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0076/0981/files/what_is_the_main_idea_of_the_stroop_effect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffd4d98-578e-429e-90fd-40bbeae3ba72/89884555964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/defaed38-4626-491a-a266-07e5e2b65240/57990054026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20a67e8-9aea-46cc-befc-63022dcac83f/30846745335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d554a4ae-0739-4ec9-b815-1b809dcbbae7/8754277698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ceb073-0e09-47a1-864d-b942493ea435/balavodojekamopogedow.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_off00006b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8D 5176 bytes
SHA-256: 7b96ce890148655aa99db0baf1e652a98ba9b1a1b283500960f8d50746507d57
font_01_sfnt_off00007d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2D 10172 bytes
SHA-256: 605079e95cd5e0b394e99940397981318ba118a93776c82ad974f0c58a967be1

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