Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a577babdacb106…

MALICIOUS

PDF

41.6 KB Created: 2020-08-27 18:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 37cb1f1e907fa8ecca5a71fc32b3d943 SHA-1: 0e5a0b683098fae26dfebe8575ba9318feda91ab SHA-256: a1a577babdacb106acec97062e47f24b0f9ee841751bbc1fd051174767171e9a
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the lure 'Background music for wedding invitation free' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, many hosted on cdn.shopify.com, suggesting a link farm designed to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS 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.com/pify?keyword=background+music+for+wedding+invitation+free In PDF document text
    • http://files.vargassuarezuniversal.com/uploads/1/3/0/7/130776779/bibexikixixu.pdfIn PDF document text
    • http://files.vibrantlifechiropractic.com/uploads/1/3/1/8/131857580/rowufeverokesim.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/1/0431/2875/0241/files/satobiverulitividufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/70895277054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/2020472379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/ronokakomenokaxekowufubo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8951/1071/files/niletesezegilenel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/free_argumentative_essay_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/24221478325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3698/4742/files/crystal_reports_runtime_engine_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/beverly_hills_star_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/57692863343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9930/7678/files/631818045.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 3

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_off00006466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 5572 bytes
SHA-256: 9d77b5588649591a62c87bbe9b081ebfa5f42b9e961014261b5016b63734184b
font_01_sfnt_off00007769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 10016 bytes
SHA-256: 5b4e628a5a8450c0815f2f579e53780284397724964a33ad2253ee82ea432c1a

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