Malicious PDF — malware analysis report

Static analysis result for SHA-256 873327c3b4ac50bd…

MALICIOUS

PDF

42.9 KB Created: 2020-08-03 11:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5473fce4b42bce1732e32cc80212e46a SHA-1: a1469ac9aa4dbca3d549a1c662b1a1a7e7d6ca81 SHA-256: 873327c3b4ac50bde417837a2aee02a722a551909e3b16fce9d34e5d6fa36b7d
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This redirector is likely used to obscure the final destination, which is probably a phishing page or malware download, disguised as a "ctet ans key pdf". The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=ctet+ans+key+pdf In PDF document text
    • http://files.leisureworldtours.net/uploads/1/3/1/6/131637211/6206d2d64.pdfIn PDF document text
    • http://files.hartfordcathedral.org/uploads/1/3/1/6/131606208/lipububazaj-kilubatomifufok.pdfIn PDF document text
    • http://files.dogtownpestcontrol.com/uploads/1/3/0/8/130814411/widagewenomugewokeb.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/1/0431/5018/0514/files/49299751212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/91263397222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4558/4033/files/us_date_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/luzupevirobupesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2305/5523/files/free_pontiac_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/29055892035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/xubula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/bemibogopokemawarapul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/19043938040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/73050301569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/60389093636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/1527616406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6277/2380/files/61406899127.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_off00006681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6681 4980 bytes
SHA-256: fcc84c8198428c13d97132e6843be31061f624ae789f3dd6448be51dad89cb9c
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 12080 bytes
SHA-256: 44ae288e6898996bd83d3f02445f831481c71107730c8fc8760bd76ba882a843

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