Malicious PDF — malware analysis report

Static analysis result for SHA-256 238ff9ffd5407280…

MALICIOUS

PDF

43.7 KB Created: 2020-10-01 11:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: a8da484db21dcc64de5d431e25932649 SHA-1: 9cf657915fa9f0ff94de2840a4e7ca1f05287ed9 SHA-256: 238ff9ffd540728011bc3cebbcabeb0816f01c8d9a9d97ab0871b3a67b19c8b8
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://cctraff.ru/strik?keyword=deathless+catherynne+valente+pdf In PDF document text
    • http://nogaja.myprintshops.com/uploads/1/3/0/8/130814328/kitujivaw.pdfIn PDF document text
    • http://dosipivi.annettedelcanto.com/uploads/1/3/1/6/131636725/9324184b6d2d6f.pdfIn PDF document text
    • http://files.fatherscott.org/uploads/1/3/1/4/131406435/daluwenexibu-pelosuxiva-vuvotowozu-ninimoginowup.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/dasenopi.pdfIn PDF document text
    • https://site-1036982.mozfiles.com/files/1036982/nolegufofunojuradatofawat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/60311fe5-5d82-4059-b806-5057448b8551/wibelojefupedawajapav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2992/1943/files/78126144795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/4235327248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6672/5030/files/toxalepuwevifex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/fuxosa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 5032 bytes
SHA-256: 178ef20a80729696a6c7cf0dd96e99499e140bffcc74629d39ffe6bebc66fdd8
font_01_sfnt_off00007178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 10284 bytes
SHA-256: 64181cc8865c1cdb31d49556a0613ddad1a9fc1d5a83997ebaa0a5314863b42f
font_02_sfnt_off00009432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9432 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e