Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf4c47fa32633b9…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 23:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c7d23f9f6dc157f4d2a9282d1cb40560 SHA-1: 9ce26a3fa8318133ce39bab8208f8779ee09c054 SHA-256: dcf4c47fa32633b98febd88b65432f865f68e7fd2e4240b67c9e47a2dd6830bc
202 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. A low-signal heuristic for a download button lure further supports the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=free%20printable%20worksheets%20short%20vowels In PDF document text
    • http://files.hippo2020.com/uploads/1/3/2/6/132681579/0731f2803b1e3.pdfIn PDF document text
    • http://files.prayerknight.com/uploads/1/3/0/7/130776327/bikizogekujiluvajif.pdfIn PDF document text
    • http://files.valleybookstore.com/uploads/1/3/1/4/131482915/liwawebe_tirotafilekedap.pdfIn PDF document text
    • http://files.littledarlingscookieco.com/uploads/1/3/2/7/132740595/fafixe.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/1/0432/5274/4356/files/fodanizenuru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/avancemos_2_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/conquering_carpal_tunnel_syndrome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/easy_snacks_recipes_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/gafotikowik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/83758421449.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/funawowapozadexis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/2101277930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/lofozani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/47025307949.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 7

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_off00006ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 5220 bytes
SHA-256: 36fb3bffdb131e15fb3caaf8a46688507ce18d327317e1c902aa7c88dd34b8c6
font_01_sfnt_off00007c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C88 10128 bytes
SHA-256: df2e004cfb09843ddc4b5df328d8d29748e4df083ea7e621e09d5e76bfd9ec92

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