Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a3c7a1c29da0b9…

MALICIOUS

PDF

34.5 KB Created: 2020-08-15 13:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 62386142b6badfdc8161174206c3a3be SHA-1: 6858dac555ba5922c438083f6061603583421282 SHA-256: 10a3c7a1c29da0b94ed3dc44065ccc30ed3daf0c424fa8876c6ff592176f8dd7
194 Risk Score

Malware Insights

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

The PDF contains a deceptive lure related to an ESP8266 NodeMCU v3 manual, which is a common tactic for phishing or malware distribution. It embeds multiple links, including one to a known malicious redirector at `https://ttraff.com/wb?keyword=esp8266%20nodemcu%20v3%20manual`. The presence of numerous links, many pointing to Shopify domains, suggests an attempt to create a link farm for SEO manipulation, likely to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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.com/wb?keyword=esp8266%20nodemcu%20v3%20manual In PDF document text
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdfIn PDF document text
    • http://files.angelsofcharity.org/uploads/1/3/0/7/130775429/8751233.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/1/0435/2288/3735/files/wumomonifimij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0120/8232/files/42065709902.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0270/7615/files/blank_calendar_may_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/konsep_caring_dalam_keperawatan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/nomedem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/42769509574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/tezojubofumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/ar_desai_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/tixinudivapedezimad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/15787967931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0460/4066/files/sony_1cf_c218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/48647293593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/43273429066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/norofikasejukoniva.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_off00004c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C5C 5784 bytes
SHA-256: af9997162c3efee0f29e4bf81eb0e8611315183b2dfe8630a29fb68b60082295
font_01_sfnt_off00005fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 8672 bytes
SHA-256: 848b6ae2d5664b7e3fe5bfcac824aac6342bf8e00280f0e8cf9309e5b9a4f9a7

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