Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cbbdbbdd43867e…

MALICIOUS

PDF

40.9 KB Created: 2020-10-05 21:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 383405be8c600b1a28c9c98ef18cd9a4 SHA-1: 22e7ffbe443ffad3b356b04089b50702bf96a4a1 SHA-256: 33cbbdbbdd43867e38e553157bbc648e8cbfcfff9bff0c8503b4e02b6df7d735
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=free+indesign+tutorial+pdf In PDF document text
    • https://site-1038429.mozfiles.com/files/1038429/dexumivukujozixigusuxika.pdfIn PDF document text
    • https://site-1036626.mozfiles.com/files/1036626/10905446561.pdfIn PDF document text
    • http://toxow.authortoddkilpatrick.com/uploads/1/3/0/9/130969572/95532c4fcbc02.pdfIn PDF document text
    • http://lewulagav.rockbustofleet.com/uploads/1/3/1/4/131411199/topegotow-rogejejosurutil-xizutil-simujojomep.pdfIn PDF document text
    • http://files.westlockpreschoolsociety.com/uploads/1/3/0/7/130738960/6903975.pdfIn PDF document text
    • http://files.stchristophersnh.org/uploads/1/3/0/7/130775850/56b57ff1ead0.pdfIn PDF document text
    • http://kosuzomox.abitgraphic.com/uploads/1/3/0/9/130969204/d4615d841817a.pdfIn PDF document text
    • http://files.ananda-devi.com/uploads/1/3/0/7/130776069/dorogusomuresi_zakarozop_fonik.pdfIn PDF document text
    • http://files.lionscb.org/uploads/1/3/0/9/130969305/180a4a1ad.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/1/0438/2674/1405/files/words_with_urgency.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5315/8047/files/91755944060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3683/0624/files/36140631176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8602/8181/files/logitech_z323_setup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/22844947238.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_off000062e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 5164 bytes
SHA-256: 9c6c6dfece8ff6212e14cb8cba716aed95163d095f0e47b3f6d9bbdd79b53962
font_01_sfnt_off00007489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7489 9928 bytes
SHA-256: 062831c3fba51ca7fde110a7e301ad7a5857ec0ba0ad2552c0d3c9403f3811cf

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