Malicious PDF — malware analysis report

Static analysis result for SHA-256 8263c8716efae388…

MALICIOUS

PDF

40.7 KB Created: 2020-08-03 21:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cb9d941d6c6451e90d1924c9bc2479c6 SHA-1: 9c2508334d6b09d5f866a6d10963b0da5d345773 SHA-256: 8263c8716efae38877f14ce29c3c46adc6476643cf2eccaabf002c4763e4c28c
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many of which point to a redirector infrastructure identified as malicious. The document body and heuristics suggest a lure for downloading potentially malicious content, possibly related to an "E. coli pdf download" theme. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to drive traffic to malicious sites, likely for further payload delivery.

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/pify?keyword=e.+coli+pdf+download In PDF document text
    • http://files.manasiev-art.shop/uploads/1/3/0/9/130969791/lopixekepevesa-xizal-lewunitizaw.pdfIn PDF document text
    • http://files.partnerstkd.com/uploads/1/3/2/6/132682171/8879954.pdfIn PDF document text
    • http://files.candacesam.com/uploads/1/3/1/1/131164027/misexalupip.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/1/0434/7078/2624/files/minecraft_dragons_breath.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7450/1285/files/28056144325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/xajaxitutexeduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/75051367967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/vojuluvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/91910664106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4248/0021/files/8241624184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/womij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4549/4684/files/82760785578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/megoxidojixugapilanaseg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/28810045754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6568/8743/files/60554123104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/48869569121.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_off000061bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 4956 bytes
SHA-256: 748b57a81209ab83c66a4f6bc9e7897cf5900d7376e2c1b6b0a6c4d99e897d78
font_01_sfnt_off000072d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 10356 bytes
SHA-256: fb789a54431601ad2620bc298b3e87f71fd8af84222b5be271a15460f16da3c3

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