Malicious PDF — malware analysis report

Static analysis result for SHA-256 38938c6bf52b7718…

MALICIOUS

PDF

35.8 KB Created: 2020-10-08 12:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c8cfbf001f45d61f192e78a6e0ca11b2 SHA-1: 39e1dce453476f496c018625634bcd0b24c38e20 SHA-256: 38938c6bf52b77189c7f3552d30bac9716ff01b30894315e8d6871e0395a438f
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=biology+dna+structure+and+replication+worksheet In PDF document text
    • http://files.thatartgal.com/uploads/1/3/2/7/132712323/zosabim.pdfIn PDF document text
    • http://navonu.pezzlawncare.com/uploads/1/3/1/0/131071157/tadilifozosub.pdfIn PDF document text
    • http://files.taylorsgreenhouse.com/uploads/1/3/0/9/130969722/gopixigovowavarun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e2d187-6fa8-4c22-82be-9705a6a0beab/12926139552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af427521-e7fd-4daa-8021-7152dd511446/ludidabelojanoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cac36a5-313d-4306-a861-c6b1d5676fef/kuxofoguxojikaboguro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b3a8bf-f0a2-4461-a580-ca7264f84876/bidirejobanozopafanel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9972fd88-33a6-4e52-a64e-aed7a4d516f7/dusimutofugali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9189/3666/files/sex-linked_inheritance_practice_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7626/3841/files/all_white_pitbull_puppies_with_blue_eyes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/80352274964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2141/2763/files/shadows_of_evil_easter_egg_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3272/6680/files/the_hitchhikers_guide_to_the_galaxy_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/haysville_usd_261_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/lefulerovikojulariwegik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/how_to_apply_hair_razor_detox.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_off00004e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E36 5644 bytes
SHA-256: 10508cecddc6ac501c72e7c7397f94284049b51162660efda407be03ef51d80c
font_01_sfnt_off00006187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6187 9532 bytes
SHA-256: 043de90afeb97c6622a36867d53a30a1ac3b354ac1a2d8900359d08717444cbb

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