Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bb431404ced184…

MALICIOUS

PDF

43.8 KB Created: 2020-10-26 15:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ef17d084482825ccd9a1d259169a66a6 SHA-1: 82be92b20d0a795efa497e2db563f9d46579a0cf SHA-256: 57bb431404ced1847e1bb6832f77d85c08d2ecae03b8360cef7678c162dea169
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.link/pify?keyword=distant+star+roberto+bolano+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8c90fdc6521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f958d640ac00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f964dc869029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_5f91dbdaaf148.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/fimadurixanoj-zovider.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/7771389.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/fijuvimurele-lipevimedawaf-romazesito.pdfIn PDF document text
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/tewalawaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f89e315b0b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_5f966cb1b24ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006d75.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006d75.bin)
    • https://cdn.shopify.com/s/files/1/0495/9875/9078/files/dulufoxulez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2413/6864/files/industrial_organic_pigments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/kapagenutodixukaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/26219918041.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/rogunuwiremumusebuxudun.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/59990678118.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/risikaf.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/77692274699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7534/6847/files/53551992560.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3950/7100/files/robinulalotazapasuse.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 extracted file (font_00_sfnt_off00006d75.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 5176 bytes
SHA-256: 7f1007bbac53475a04d5240c0c37714f7c8d4c5b69bf4be1945dfaac9f160a96
font_01_sfnt_off00007f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F10 10256 bytes
SHA-256: 854aae3febac64e00faa804a5868f8cb6e99b000ee02e9ce2c7d23681e8dccd1