Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40f4a0ef5363b5c…

MALICIOUS

PDF

37.8 KB Created: 2020-10-09 16:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f8afb724de08cf8b270ea20928e18535 SHA-1: 2de83661113af5a94357940251b220403e6ff0cf SHA-256: c40f4a0ef5363b5cb244f80a0ba4bf668b5b8d6575ce3c2d63622498da117d55
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://gettraff.ru/strik?keyword=murdock+hall+asu In PDF document text
    • http://pazubuk.tdsministries.com/uploads/1/3/2/3/132303052/wuvolewovisuzunefuze.pdfIn PDF document text
    • http://nazadun.2ra.co/uploads/1/3/0/7/130739678/jepalizu.pdfIn PDF document text
    • http://porumok.janiceandbud.com/uploads/1/3/0/8/130814855/timezot.pdfIn PDF document text
    • http://files.kwdrivefamily.com/uploads/1/3/0/8/130814169/lamelekavasiliv.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/1/0437/1801/7175/files/baxopofixusuwivefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3690/1013/files/64786963867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/raymond_free_software_telegram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2925/7122/files/rafawoguxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/12737580543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad531f2f-ef1e-4dc4-95f6-8c7236c103e5/zivowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef11ca83-5a37-4b2f-a70a-3d63802432ca/43433967609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34478fa-9fc8-4cf4-bb71-031f59bcb0b1/tusewixiligatixofokab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdd4525-871f-4536-a2f3-2f92b9516a14/besemibinafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003a61f6-a344-4e7a-9e13-2ef36155ea72/85118651049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7480/4126/files/31303846176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9407/6312/files/70654775222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/4301/9941/files/be_joyful_mary_heavenly_queen_anthony_giamanco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8719/0952/files/vvt-i_oil_hose.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_off00005530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5530 5096 bytes
SHA-256: 945365cdeb851ba061f8e2570021e52e6dedf4a93dd1e0f18e540ba652630fc4
font_01_sfnt_off00006685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6685 10636 bytes
SHA-256: e0023890cbd52f25750042f8ebecfc37de88913221fb740d8258a4e30374ea3a

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