Malicious PDF — malware analysis report

Static analysis result for SHA-256 53955ae066f9272e…

MALICIOUS

PDF

62.1 KB Created: 2020-08-14 19:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9c8dae36c90be699f673b104dc98d8c8 SHA-1: 38b46738b9da05e394621af132bec4b1aa2fd681 SHA-256: 53955ae066f9272eefde03cec27c26922fe8f16110ef4329b1c1500288778294
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'nih stroke scale answers pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated 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.cc/wb?keyword=nih%20stroke%20scale%20answers%20pdf In PDF document text
    • http://wedupufel.marcushedahl.net/uploads/1/3/1/1/131163590/3866220.pdfIn PDF document text
    • http://razus.exfoliantsbymalika.com/uploads/1/3/2/6/132683188/795b67a631.pdfIn PDF document text
    • http://tibejup.jhuntermotivatingminds.com/uploads/1/3/2/6/132681946/dekekorapeliwu.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/1/0437/7742/5557/files/anne_of_green_gables_book_series_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/budget_report_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/chicos_formal_dresses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/xenuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/person_centred_therapy_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/gosojazuduratasizaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/95692668682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/55834820905.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5452/1758/files/tobozitex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5778/9593/files/3506694324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/78246292148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/13344095514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/hallelujah_cohen_emerson.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD0 2828 bytes
SHA-256: 9e930a7addac52418864887927ca661210cf52205186850714eea3b38f618a2a
font_01_sfnt_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 5368 bytes
SHA-256: 8a13f48a9cedd2119c2ea5a99ac51a1a36e94816a09e316996e069354dbaa15e
font_02_sfnt_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 10064 bytes
SHA-256: 2bd7c2d9251bdccc5067c2e666b941bcca85de28de4e3e31475a279b8437a92c

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