Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d324788fea74a0a…

MALICIOUS

PDF

52.5 KB Created: 2020-10-03 05:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8092b742e1c6797fa2f00852a571659b SHA-1: 2efc89fd0a0a963cc6176447e59a97fa46e664ed SHA-256: 8d324788fea74a0ad2c2553abe584da681222334b18687d2f9ac4e5fba022d76
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=injective+and+surjective+functions+examples In PDF document text
    • https://site-1037840.mozfiles.com/files/1037840/11490191211.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/vejekelijepole.pdfIn PDF document text
    • https://site-1039935.mozfiles.com/files/1039935/21193061610.pdfIn PDF document text
    • https://site-1038351.mozfiles.com/files/1038351/12331469823.pdfIn PDF document text
    • https://site-1036684.mozfiles.com/files/1036684/xegovizubuvanux.pdfIn PDF document text
    • https://site-1037885.mozfiles.com/files/1037885/95714772759.pdfIn PDF document text
    • http://zozebikig.peninsulafilmfestival.com/uploads/1/3/0/8/130874388/lajekolixuzegeta.pdfIn PDF document text
    • http://norewi.hendrickscountymrc.org/uploads/1/3/1/4/131408024/fiviw.pdfIn PDF document text
    • http://files.atmopav.com/uploads/1/3/1/6/131636576/fetizidojon.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/1/0486/1863/5422/files/flocabulary_unit_4_answer_key_chad_and_the_little_horse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7768/7701/files/21272184021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5955/5735/files/arcadia_invitational_qualifying_times_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6773/8786/files/filotapuw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E55 5444 bytes
SHA-256: c4dfb7a5007476855c25de2659c334c132d88313ca886e509ebb5a4ce428fbfd
font_01_sfnt_off000080d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 13704 bytes
SHA-256: ab469fd2bc553700d804aa835355b20298930e9a1fb4be2bb3fb684071289bcb
font_02_sfnt_off0000ad02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16644 bytes
SHA-256: 3ff642d2595123245aa9880a00aa5466416c15bbd415f2a1415aeb9c6372850c

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