Malicious PDF — malware analysis report

Static analysis result for SHA-256 28538d91a5d6890a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b78e9a8dd1ace7ebf2eca19f812f1a94 SHA-1: 7f3f7701a1dcf6a77149df01b47730926995fd0f SHA-256: 28538d91a5d6890a05e83c1362835266fe88be1d2887e5ae5630e9e17d02f0f4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector infrastructure. It also features a link farm of numerous external PDF files hosted on domains like Shopify, suggesting a tactic to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is https://ttraff.com/pify?keyword=linea+base+ambiental+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=linea+base+ambiental+pdf In PDF document text
    • http://files.betsyleebaileymusic.com/uploads/1/3/1/4/131453215/fumuripaw_xofidirawekimu.pdfIn PDF document text
    • http://files.myfoodpassion.net/uploads/1/3/1/8/131871705/nedalarida.pdfIn PDF document text
    • http://files.bakshlab.com/uploads/1/3/1/4/131408172/donovurozodun_vepepapedesos.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/1/0430/5174/5442/files/33243808582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/benuworopomisazutepawot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4002/0382/files/80567644025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/xawubapiguzoravawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/acta_constitutiva_de_una_empresa_formato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/manufacturing_science_amitabha_ghosh_and_ak_mallik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/measurement_worksheet_5th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/one_day_at_a_time_sweet_jesus_lyrics.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_off0000637b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 5172 bytes
SHA-256: da7d32638678a0d2be0950e80b35b09f162f6cff2e2dd9ddbafcfff4429de1dd
font_01_sfnt_off000074fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 10280 bytes
SHA-256: f56adb65e8af42ef9292657fda783a4d1242ce396b77a4eacae5d2e993c7c4b0

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