Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dcb662bae4f09a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-12 07:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 71f6f950563fe51302e097e74cd33f9a SHA-1: ce8cfeefe869e60a448ecd2ce8163f46404ba906 SHA-256: 51dcb662bae4f09ab33f7364c94ea9b4564de1d7f49d1e74a90eb3ca990c088a
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.com/wb?keyword=practical%20clinical%20pathology%202nd%20edition%20pdf'. This indicates a phishing or redirection attack, likely aiming to exploit user curiosity about the book title. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector link is a strong indicator of malicious intent.

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/wb?keyword=practical%20clinical%20pathology%202nd%20edition%20pdf In PDF document text
    • http://files.bikeforlifesd.org/uploads/1/3/2/6/132682802/peguko-safewarosamesu-kafivilozobo.pdfIn PDF document text
    • http://files.mission520.com/uploads/1/3/2/6/132680827/50611e15302d.pdfIn PDF document text
    • http://bugub.girlstothemic.org/uploads/1/3/1/4/131437363/revebakejasikab-fexepufixul-powidufun-rajavemafig.pdfIn PDF document text
    • http://vasuzos.crestridgefarms.com/uploads/1/3/1/6/131637136/perofozaguwepetoleg.pdfIn PDF document text
    • http://files.jjraccounting.com/uploads/1/3/1/3/131378916/kusinizararoma.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/1/0431/7007/0687/files/tesukujutozagikurutut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/rokixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/urticaria_y_angioedema_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/zarafijaxuniwineni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/wafebemumojodoxagavukovob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9849/6412/files/rodafuxekofubukujijisedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/unethical_behavior_in_the_workplace.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/58543261195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8787/1646/files/padux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/verbal_bullying_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/wisajivepalibuxom.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD6 5260 bytes
SHA-256: 8e201228ca13964df334991107c512df4f973bfd24f77f3b7b86545910b5472d
font_01_sfnt_off00005ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA5 10012 bytes
SHA-256: 3e444412ae805a02a57dc69f98d7d29c55000964fca9f9dfcfb60077a8c2a4fd
font_02_sfnt_off00007edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c