Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d7383e1cac7046…

MALICIOUS

PDF

51.5 KB Created: 2020-08-18 15:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 40a4c839c743c7d8ceee85433edf3934 SHA-1: bfb08b3566420c4c7f1bbb1c7bb8a2e3127e6774 SHA-256: 19d7383e1cac70462d113274f1793df4cb1d314ee8230d44edd9f586effdd9c6
194 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=amphibolin+caparol+pdf, which is likely used to funnel victims to further malicious content. The document body itself is heavily obfuscated and contains remnants of this URL, reinforcing its role in the attack.

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=amphibolin+caparol+pdf In PDF document text
    • http://files.azzurebeauty.com/uploads/1/3/1/4/131438891/pisobifikul-niterereden-fowitoga.pdfIn PDF document text
    • http://files.sankeycomputers.com/uploads/1/3/0/7/130738758/30fde69b39c248.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/1/0427/9782/6207/files/install_adobe_printer_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/bokan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/83008255038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/posukax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/wurojofuzalizivevix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/luxomizavupuxoti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7179/8436/files/64921408649.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 4

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_off000088bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BC 5348 bytes
SHA-256: c0a250d2e3bf78581b4e974f072053620d6eef5fb789f2ba7582d1e0953ad4bc
font_01_sfnt_off00009aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA8 11440 bytes
SHA-256: f2a8807b148535097cad89f448e1af7a6a71a961e376b44fb0e3b2accf918113

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