Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91c32b486575fae…

MALICIOUS

PDF

41.7 KB Created: 2020-10-02 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 109a6a407033bf1860d7532c91955618 SHA-1: b55f7b969afd4f76facb350108b97cea465f2ba0 SHA-256: a91c32b486575fae046d47535ef6816afb72acc42e417a18966ebae766ed21b3
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.club/pify?keyword=new+york+times+upfront+magazine+quiz+answers In PDF document text
    • https://site-1039285.mozfiles.com/files/1039285/7530063908.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/gokisidezenefoxuwenip.pdfIn PDF document text
    • https://site-1037843.mozfiles.com/files/1037843/defowidisixufoli.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/74479020464.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/27729969397.pdfIn PDF document text
    • http://files.hermanngardentours.com/uploads/1/3/1/6/131607023/refuruxazawezetel.pdfIn PDF document text
    • http://files.carlbergbo.com/uploads/1/3/1/3/131381374/2c99073ae.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/1/0483/7736/4637/files/rift_shaman_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6769/9111/files/87784535900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2130/2946/files/13656954566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/78436337620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1016/5400/files/jigopatataj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1504/4263/files/dezik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0796/2020/files/ky_division_of_plumbing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0352/2468/files/85950695519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5979/8167/files/peroxisomes_and_lysosomes_are_sacs_that_contain_enzymes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/the_princess_bride_drive_mp3.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_off0000641b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641B 5592 bytes
SHA-256: 532f791d72bee7069bed617dc9e65bd57c75903d7608c97f1c789b24ac28e764
font_01_sfnt_off0000773f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773F 10156 bytes
SHA-256: 96a4c51520dfedd5830ab0a5bcd79eee275962801484af2a3bff0e3f9a90e54c

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