Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad163b72498589c…

MALICIOUS

PDF

42.9 KB Created: 2020-07-28 06:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 860da56db40177a6d5df28f17e57eea5 SHA-1: 817f8009fde59c4a6377b95b9a8f2eb5fab5679c SHA-256: 4ad163b72498589c3f45a7d5ef8e4c7ce628cb9904914f9282b555b0f5df641e
194 Risk Score

Malware Insights

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

The PDF file contains numerous links, identified as a link farm, designed to redirect users to malicious infrastructure. One such link points to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Calendario 2019 pdf colombia', suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to potentially harmful websites.

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=calendario+2019+pdf+colombia In PDF document text
    • http://files.coleenparatore.com/uploads/1/3/1/0/131069950/buvosanigisatupo.pdfIn PDF document text
    • http://files.mssciencefest.org/uploads/1/3/1/8/131856352/442709.pdfIn PDF document text
    • http://files.tejanathings.com/uploads/1/3/1/3/131380604/jurifesumodu_tezakawuz.pdfIn PDF document text
    • http://files.a2zcomputerhelp.com/uploads/1/3/0/7/130776888/sewidogos-wikosafefo.pdfIn PDF document text
    • http://files.homelesshaventv.com/uploads/1/3/0/8/130874102/47a2151b05eff.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/1/0439/5198/0712/files/pugukowav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/89378499914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/69964172130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/kenatubipapitofaxib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/texoralo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/19278534332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/35291882767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5042/5753/files/semuvasef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/35489831067.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 8

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_off0000676e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 5476 bytes
SHA-256: b20f51ecfedb8fc67e9da0da6f844636727a94985147c3e010b9be9b935ff6fb
font_01_sfnt_off000079ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79ED 10784 bytes
SHA-256: cc737206041d5d1927fe92ebb719a4aa3b2515b72e646e82c5da0368eb071d20

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