Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f87aebb6b4c9b8…

MALICIOUS

PDF

51.1 KB Created: 2020-08-09 00:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8ac59a513724b7db864e8dbc8d8f6a97 SHA-1: 6aef23b3a67336520b80a98a7ec20d87a8de8aeb SHA-256: 23f87aebb6b4c9b8c03d48fd602e1893dec9464c97c4b8bd675c965c74d46b42
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though partially corrupted, suggests a lure related to academic writing. The primary malicious indicator is the link to 'ttraff.ru', which is flagged as a malicious redirector. The presence of numerous links, including those hosted on Shopify, indicates a potential SEO poisoning or link farm tactic to distribute malicious content.

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=an+insider+s+guide+to+academic+writing+pdf+free In PDF document text
    • http://files.ogrowneyns.ie/uploads/1/3/0/9/130969080/zemusinereg.pdfIn PDF document text
    • http://files.roberthillpsychologist.com/uploads/1/3/2/8/132814791/tasunenixa.pdfIn PDF document text
    • http://motezedeg.ashengroundcc.org/uploads/1/3/0/8/130874493/6977337.pdfIn PDF document text
    • http://files.alidwyerofficial.com/uploads/1/3/0/8/130874204/zoxozikabol.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/1/0430/1540/5725/files/convert_scanned_to_editable_word_document_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/6057294230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/wow_warlock_pets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/19793266642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/74854682518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/xakufofevitisadopalagug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/70288233405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/lopevujetuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/16361519743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/jukomaxipan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/87398399695.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off000071fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FD 5524 bytes
SHA-256: b437af70e2a3c89d3662f700f379b092cd362ee9ad34fec600fb9f8c583ea9f2
font_01_sfnt_off000084c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C2 10420 bytes
SHA-256: 0bfce61daf371bcb72fc717273cd841e21681461a6da9f10dce8815358de46e1
font_02_sfnt_off0000a892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA892 16448 bytes
SHA-256: 3f7f6beb0f5865f83039c8434023d34048916fbab515aea8bfee4d6c7e3f3101

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