Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a19fe23237307bf…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 14:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8190438dae4be38f7d818c4129ea7984 SHA-1: d2a3d9c6ed097bdb43af4254195faee93f81bdac SHA-256: 4a19fe23237307bfbe274127f54e23be36d24157620cd085436ff906d62ced2f
202 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet answer key, which is a common lure. The primary malicious link, 'https://ttraff.ru/pify?keyword=naming+ionic+compounds+worksheet+answers+page+45', is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=naming+ionic+compounds+worksheet+answers+page+45 In PDF document text
    • http://files.edtechtalk.org/uploads/1/3/2/7/132740905/8d9f0ad0a.pdfIn PDF document text
    • http://nizeledev.anamcarafolkmusic.com/uploads/1/3/2/8/132816202/f5dd3409b1d8.pdfIn PDF document text
    • http://files.missionbeachaustralia.com/uploads/1/3/0/7/130738501/2967423.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/1/0440/1378/1157/files/credit_reporting_bureau_news.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/sekumam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/66645191581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/polmicas_na_igreja_augustus_nicodemus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6901/3158/files/shockwave_marble_mania.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/rotuzononutupafaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7314/1912/files/designing_data-_intensive_applications_filetype.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/18776476097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/64651630376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/zisutagojefelakagowafuniz.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_off0000593a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x593A 5792 bytes
SHA-256: fcb16a79a079a15df79e58885c0520a1199e77ee68b53bb305565b96e748310f
font_01_sfnt_off00006ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE2 11052 bytes
SHA-256: 89c1e9e20254284c13fdf3c0737c282b405276b63b163e74e83928dd02337e88

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