Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a49ff8b3a966a5a…

MALICIOUS

PDF

56.4 KB Created: 2020-10-02 07:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d9758df653f188cb473e6eec0343fb22 SHA-1: 24ae8967284358cad8ac47fb292b465404ec83b7 SHA-256: 8a49ff8b3a966a5a1a53a2c0b33095d3ab74d9609e40e0eba5604d2ccef6ec13
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/pify?keyword=paypal+cash+advance+warning In PDF document text
    • https://site-1039535.mozfiles.com/files/1039535/rorakinexor.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/nojozefobu.pdfIn PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/rimadotu.pdfIn PDF document text
    • https://site-1037227.mozfiles.com/files/1037227/rokejezuwedivejezoruxidi.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/demivonemafijapez.pdfIn PDF document text
    • http://nivove.alldogkind.com/uploads/1/3/1/8/131856713/9148304.pdfIn PDF document text
    • http://lafosav.andrew-harris.net/uploads/1/3/1/6/131637814/nuwisoruwaxaben.pdfIn PDF document text
    • http://files.andiamo-ranger29.com/uploads/1/3/1/3/131382092/pajoj-goxoworusuwofez-fozek.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/fibebuzedemed.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/14421034899.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/1/0481/3733/9031/files/madozitam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/spin_a_yarn_steakhouse_fremont_california.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0533/2634/files/revupepubuvegesenebanemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/9345/5772/files/xepexamedu.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_off00009e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E86 5592 bytes
SHA-256: 196af7e77951989cecae433465772a99fcf80d9d5ff3b3d274037930627d6072
font_01_sfnt_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 10280 bytes
SHA-256: 324a12ca0369fd5d9063c89360dff26a377a09cc7f3bd38dff5b3a21fc148d04

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