Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61b1a3c4a7fb73…

MALICIOUS

PDF

43.0 KB Created: 2020-11-01 15:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 1e9e08fd3c909bf8663d2290ac02cd23 SHA-1: a58825db4f6b2c4b67b0918b4d9e7582fa700249 SHA-256: ce61b1a3c4a7fb73e6aa95629778e748a0b4cf0b7c619cb1a7789cfcce0682c6
214 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=roadrunner+email+helpline+number In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_5f9eb4043dad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_5f988d1d34b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f943807688f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5f96434eab5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5f9e07511f66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f92822653e41.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006734.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006734.bin)
    • https://s3.amazonaws.com/widiku/barcarolle_offenbach_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bizikedekalavaralopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8209/7834/files/best_java_compiler_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/vowazuji.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/lions_mane_jellyfish_maine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/factors_that_influence_wound_healing.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/83522426414.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_off00006734.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6734 5168 bytes
SHA-256: db94cd004fe31cb59bf9a29b06c62bb64e45e96cc6292c41bc5d154d9227ad94
font_01_sfnt_off00007892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 11416 bytes
SHA-256: e6341c9cc1472519e37a02d5df9be286c3f20edfdb003a973db0bc0a0fc60908