Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c511ff6e136240…

MALICIOUS

PDF

35.2 KB Created: 2020-08-25 18:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6fc54314144187df187a9fd853048736 SHA-1: ea1d2f2adf140a8c506d45166617e988cba16331 SHA-256: 21c511ff6e13624021556dfacca7776e939a4aeba4af91238c9357aa2104ad4e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, with the primary URL pointing to a redirector service. This suggests a phishing or malicious content delivery scheme where the redirector is used to obscure the final destination. The document body itself is heavily obfuscated and contains numerous links, reinforcing the idea of a link farm designed to lure users to malicious sites. No scripts were extracted, limiting the analysis of direct payload execution.

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.cc/pify?keyword=diftongs+i+hiats+esquema In PDF document text
    • http://files.vtrustjournal.com/uploads/1/3/0/7/130775760/5738340.pdfIn PDF document text
    • http://files.rockiesshrine.com/uploads/1/3/1/8/131856492/lusitonuniwejononob.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/1/0433/6074/7688/files/american_standard_air_conditioner_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/niboduxirapoxogowil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/83339355006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/6869/9303/files/ibm_aptitude_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/92715800110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/nexiluwupozisovijanazepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7949/1733/files/samsung_frp_bypass_apk_rootjunky.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/xujesuponozabaloxokogeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/template_for_personal_finances.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4279/7730/files/gadiximupob.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB5 5176 bytes
SHA-256: 2c9dc91d1501404455d107bf59b50748f35a6625608d1252dbb316a329153b7b
font_01_sfnt_off00005e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E35 10064 bytes
SHA-256: b87735ff80707b2aeb7d2fdc6a9c6c3086317d8d29dd09b6b0cd06f49f6dddc2

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