Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adc15552abdd6e5…

MALICIOUS

PDF

40.3 KB Created: 2020-08-15 23:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dd8e542ff272641ed9fca16511047d4c SHA-1: 7e45dc1f1f70d2c2993d5d8828a4e9af00fd9eae SHA-256: 5adc15552abdd6e5bc091374215affcb3b4aab7d98dc7cf6b1c2bc2155b0e933
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though obfuscated, contains text related to 'psat practice test 1 pdf' and a URL that mirrors this theme, suggesting a lure to trick users into downloading potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links further supports a malicious intent.

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/wb?keyword=psat%20practice%20test%201%20pdf In PDF document text
    • http://files.m-d.systems/uploads/1/3/0/7/130775505/semelevejijag.pdfIn PDF document text
    • http://files.capoeira-aca.com/uploads/1/3/1/4/131438460/3f58a9a.pdfIn PDF document text
    • http://files.mondaynightmotivation.org/uploads/1/3/1/8/131856757/xoralejada.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/1/0431/2698/0770/files/javascript_force_download_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/23267089476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/bible_quiz_questions_and_answers_on_ruth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8671/4782/files/proscan_tv_manuel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38804475130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/52034715074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3729/3724/files/fenewafurol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/94784833643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/95616452027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4088/9240/files/28621248607.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 6

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_off0000605c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605C 5172 bytes
SHA-256: 22181eccf4e783edfd05cc64c23345959ac83012723c1b4d3a3072436a93ba75
font_01_sfnt_off00007201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7201 10160 bytes
SHA-256: cf9f7e1fd24f23b62399a4c51dbf3f32195f0e4fd1ede0496d5fc8acf37757f6

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