Malicious PDF — malware analysis report

Static analysis result for SHA-256 da91f673c1554755…

MALICIOUS

PDF

38.6 KB Created: 2020-09-07 17:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 167ff17d6e61f4c2cef42fe04e7065af SHA-1: dd08c95c115f899e51f58f00eab6c3517a07fa89 SHA-256: da91f673c1554755b642a14933dd0bc2a7415438832fb2b11c34005418311608
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.cc/wix?keyword=appareillage+et+installation+%25C3%25A9lectrique+industrielle+pdf In 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/1/0430/5397/3657/files/monthly_behavior_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9054/3519/files/after_effects_alternative_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/vesuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xatet.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/64f9d2_a1c07821cee44a4ca28348d98d9b5251.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9c0842_fe895f5ce797476998e49264c26deb7a.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/60853471391.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9594/8454/files/texule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/9543/2872/files/worksheets_colours_esl_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/14342073280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/55773772384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/lavender_town_viola_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5937/4230/files/naruto_shippuden_opening_song_blue_bird.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/ximejogozuxaxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/8437826872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/mosalubigenuwik.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_off00005490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5490 5580 bytes
SHA-256: 242669a1b9aef41f41759f2dc3745c9714ac465545612ba8311e9e8ce9e5bad8
font_01_sfnt_off0000674d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674D 11080 bytes
SHA-256: 02a8f462f9b8e077809585a7b4dc6debeb61f6e60e0d7eafbd35bc94793d33f3

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