Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef21e8f3f6c0ccc8…

MALICIOUS

PDF

61.1 KB Created: 2020-07-30 21:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7d6288d6607a6cc280fba466d3a8a586 SHA-1: 0ad2051f847959b17e7d9fe3929fe86be3fc2628 SHA-256: ef21e8f3f6c0ccc81c7d2712cb3dd396c8865ab80909ca4234d6e976544cf777
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, a common technique for phishing or malware distribution. One of these links points to a known malicious redirector, indicating a high likelihood of malicious intent. The document body is heavily obfuscated and does not provide clear textual clues, but the presence of the redirector and the link farm strongly suggests a malicious purpose.

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=ccdc+5a+pdf In PDF document text
    • http://files.skyleblanc.com/uploads/1/3/0/9/130969989/2841229.pdfIn PDF document text
    • http://files.cfstephenville.com/uploads/1/3/2/8/132814241/gakitabifuvamit.pdfIn PDF document text
    • http://files.rhiannonlisettehenry.com/uploads/1/3/2/7/132740414/gofumarubut-wezono-bubojovaz-jobinaroxol.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/1/0436/2344/8736/files/naxibiworamofivepuxewiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/pizurafoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/vekamigoperoxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/bozukujudapulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/jibanamawuzigevinizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/logatilujajelawam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/fifitatipebaliw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3327/1191/files/jununusudapemawodogijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/87166942277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/nemob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/78896065480.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 8

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_off0000b6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FD 4316 bytes
SHA-256: 03034b0a1238a12a2075e8797d88aed6a585427b09586673be6d30b54b0b227c
font_01_sfnt_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 9996 bytes
SHA-256: bf25d00e766a1c801a2399f737a4a9dc8708bab101b7c302f2e6ebcf4e4c0289

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