Malicious PDF — malware analysis report

Static analysis result for SHA-256 879c9a51a4dd48d2…

MALICIOUS

PDF

45.9 KB Created: 2020-08-17 16:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ba4f877358a7e75b10c10653ef3b4326 SHA-1: bb9f50227eda73e2bba647544271ed6f305ad9c6 SHA-256: 879c9a51a4dd48d2d16cd426165756c6e649549c8569627708d3f306489d3ded
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://ttraff.com/pify?keyword=dress+code+formal+wedding+uk In PDF document text
    • http://files.jsbasscounseling.com/uploads/1/3/0/7/130739239/wugip.pdfIn PDF document text
    • http://tudarek.dwolf.eu/uploads/1/3/0/8/130873965/657325e.pdfIn PDF document text
    • http://files.sweetpotatojohnny.com/uploads/1/3/0/7/130739891/zimutefotenozixaxim.pdfIn PDF document text
    • http://files.laspiritualarts.com/uploads/1/3/2/3/132303264/426802.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/1/0427/6856/4380/files/2135484816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/34757101299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magizokoluredofet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/6627019694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/zuletamarekasab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/12102629374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/git_commit_message_style.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/89875474994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/turn_on_the_light_lyrics.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_off00007599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7599 5496 bytes
SHA-256: 83ad571a052d92ec26b89eee03b024efbfa9ae3761c02e62134286849fd132ab
font_01_sfnt_off00008843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8843 10120 bytes
SHA-256: f506a1790fd130c10d13092a662a7dee81ab314f5280a06e118ffe56ca95b65e

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