Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631aa2dfd1d4b7d…

MALICIOUS

PDF

37.1 KB Created: 2020-10-04 21:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 53bc650582298abdd324f13bf7360cf2 SHA-1: b8deb20d4989f080c99c64fa7b355e5397888425 SHA-256: 6631aa2dfd1d4b7d772b8a3d167a7e703cc2d53814237b6cd12a0dc033fa5fc8
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=hwp+to+pdf+conversion In PDF document text
    • http://files.greenlightbikes.org/uploads/1/3/1/3/131380354/sewesakavum_varuwetuvoxo_xezigugibasobo.pdfIn PDF document text
    • http://files.maryleemdpc.com/uploads/1/3/1/6/131637385/bitefaxap.pdfIn PDF document text
    • http://xuwupodel.ramamath.com/uploads/1/3/2/6/132681670/vivujibutagixus_nimugasakojo_lafokutepog_lakatewu.pdfIn PDF document text
    • http://files.mcgiverncarpentryservices.com/uploads/1/3/1/3/131379820/wonoxejet.pdfIn PDF document text
    • http://bekitox.catmorgan.com/uploads/1/3/1/4/131437549/1c5a465a522.pdfIn PDF document text
    • http://files.barnfullofequines.com/uploads/1/3/2/6/132681976/1017055.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/1/0483/4217/1799/files/simpson_scientific_method_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/crossing_over_occurs_during_mitosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/69554393964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/61635506017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0513/6024/files/wegex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7893/5448/files/72081104213.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_off0000559d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559D 5020 bytes
SHA-256: 38100a407a82a7f9c0d2c8b78d9f793d5e4a58dda22fdfa412e0bac937fda88e
font_01_sfnt_off000066e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 9660 bytes
SHA-256: b590e9ab6509b02e37f96c7db5412c84847e689e1fdf8a970990a8b06e536cb5