Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a7558382c88298…

MALICIOUS

PDF

41.6 KB Created: 2020-10-28 18:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7c67b70e91d5688c56ca912038c100d0 SHA-1: 2e774932cda729d9573d73117b59c50a3f1ad70d SHA-256: 43a7558382c88298dfc4b5bddc13031310571b014e7b4c683ca1036776550b8b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious link identified is https://gettraff.ru/aws?keyword=village+inn+at+apgar+phone+number, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to a malicious site. The presence of numerous other PDF links indicates a link farm or SEO poisoning tactic, likely to obscure the true malicious destination.

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/aws?keyword=village+inn+at+apgar+phone+number In PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/819ac2f13.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/1/0485/2645/9035/files/nazla_ka_upchar_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/javavageximelibirokazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7521f465-d27f-4b36-85a4-ca6cff2bf7b6/gumaroxebikubugezopugita.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/verdadera_historia_de_la_independencia_de_mexico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9328/5792/files/fanatic_tower_persona_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe16e76-c425-4235-9eac-02e8cca3f045/2916651572.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/kufebukidib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e00d86-9816-42bb-af6f-3b65fd28f4b3/zhuangzi_book_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce8137f-fc57-4d34-8ffa-caefa4767358/80567304800.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/zizigomer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3540/1633/files/i-360_cover_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895461bf-8aaf-4b61-aa6d-99bb27ff640a/17421931025.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/siwibimajotodoxazusonuxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945557bf-9575-46e4-9d6b-acbddd8727d2/23193537791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2103/6452/files/68930163758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb8e7ee-7423-46aa-9fc6-191abd14773b/japuvaladiwituvulufulu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/business_studies_class_11_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0087/5173/files/phil_iri_passages_2020.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_off00006438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 5160 bytes
SHA-256: aa35709a2d5b35a790599bc8fe57848d460bf69ed5bd9d09bf216bb97a04ffef
font_01_sfnt_off0000759f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759F 10488 bytes
SHA-256: dd63455837122177b5c927444c2ada6d76ab9cac7fbec2ebdf2b17dc133e98c6