Malicious PDF — malware analysis report

Static analysis result for SHA-256 d117afaa77ca9b81…

MALICIOUS

PDF

40.6 KB Created: 2020-10-07 09:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a4c595a952570528170be9ec311eb380 SHA-1: e771e74f434caacce7e1f3a1aa158b9ce9072f5c SHA-256: d117afaa77ca9b81168181343a3291561f6749b333b603faf377986da4b7a33d
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/pify?keyword=linear+combination+method+3+variables In PDF document text
    • http://sazap.christianclergyinternational.org/uploads/1/3/1/3/131379992/7867531.pdfIn PDF document text
    • http://files.matthewdjaeger.com/uploads/1/3/1/3/131383630/vabujubolosim_zibapatiwow_wesiva.pdfIn PDF document text
    • http://files.wheights-sda.org/uploads/1/3/1/3/131380480/6364901.pdfIn PDF document text
    • http://files.myonlinecreative.com/uploads/1/3/2/6/132682230/sagugarugolux.pdfIn PDF document text
    • http://mivupiv.sprucecafe.com/uploads/1/3/1/4/131438044/kazadivufagibeme.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/eb0d7269-328b-4481-9a7f-ba665c123873/momud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897a6ae2-127f-4d35-a086-34d15a8368af/42324826117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3250f99-eea9-4e4d-8180-3b8c3036ae12/vufugefej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7139d9a5-0e7e-4150-8b3d-d046ea49d161/gujuzime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/anime_style_artist_for_hire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/spacehunter_adventures_in_the_forbidden_zone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6127/0935/files/sauder_harbor_view_computer_desk_with_hutch_assembly_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2551/7722/files/24433542748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7829/9031/files/chihuahua_poodle_mix_price.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_off000056b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B3 5484 bytes
SHA-256: e070d0cb633f061f1602d9931c4cbdb1e25a0b2190628e775d71256c56eb56a0
font_01_sfnt_off00006932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 13948 bytes
SHA-256: 322158475c0be73775d71373a6b4f1a8b2ace47bdea53d3831c476f67f2750e3

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