Malicious PDF — malware analysis report

Static analysis result for SHA-256 a661db5bfe5d6346…

MALICIOUS

PDF

43.1 KB Created: 2020-08-21 23:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d060429add4056f0aa863cccb47e8e7b SHA-1: a9ecb6833e3ce1a1e4712b7ddd1e300444041e4d SHA-256: a661db5bfe5d6346fccdad3fb0df6d617f9a1d61ab2f51846509f8dc92466712
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified as a redirector for phishing or malware distribution. The document body, though heavily obfuscated, contains the URL that is also flagged by heuristics as a malicious redirector. This suggests the PDF is designed to trick users into visiting a malicious site by appearing to offer relevant information.

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=atrial+fibrillation+medication+guidelines In PDF document text
    • http://files.thebettajivereview.com/uploads/1/3/1/4/131438011/relur.pdfIn PDF document text
    • http://miziwonul.beckerbelieveit.com/uploads/1/3/0/7/130738950/6084433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/77978925480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3123/1649/files/24419975753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/nanoketu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/fawojixaxirurova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/zigusex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4018/6268/files/large_milk_stardew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7093/8533/files/credit_card_authorization_form_hotel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/htet_computer_science_books_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/gugininasisub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/ludwig_van_beethoven_biography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0055/3635/files/change_date_format_php_strtotime.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0E 5352 bytes
SHA-256: a125754ca418984d5d3bafde2846a0ced92d159b8a875efaa96dbc0aa48366d8
font_01_sfnt_off00006f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1C 10028 bytes
SHA-256: e5a44c52e9ef13321a4c0c55a208f08b81328a279857708c9d1c1a52f44ed98f
font_02_sfnt_off0000915e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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