Malicious PDF — malware analysis report

Static analysis result for SHA-256 421fb4c694b70625…

MALICIOUS

PDF

40.5 KB Created: 2020-09-17 15:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 912ea25336a71fc13632f522c91534f1 SHA-1: 8622f9d0ff76674866bde54fdf86c670c4085fe2 SHA-256: 421fb4c694b706252db3451457f38386fcdb12b75587510a16416fe80f603e84
184 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 external resources. One critical heuristic identified a link to a known malicious redirector, specifically `https://ttraff.club/pify?keyword=bloons+tower+defense+5+android+apk`, which is designed to lure users into downloading potentially harmful content. The document body, though heavily obfuscated, also contains this URL and other links that appear to be part of a link farm, suggesting a social engineering tactic to distribute malware or lead users to phishing sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=bloons+tower+defense+5+android+apk In PDF document text
    • http://tunuragu.apextravelogue.com/uploads/1/3/2/8/132814956/0f32dbbbc.pdfIn PDF document text
    • http://suriraz.basilyates.com/uploads/1/3/1/6/131606457/623440.pdfIn PDF document text
    • http://remafofos.wasbc.net/uploads/1/3/2/3/132303307/vawilorexizel_jitagobesorikuj_tamitulaje_tamovonepalurub.pdfIn PDF document text
    • http://files.effective-leadership.com/uploads/1/3/2/8/132814306/894129d2653231.pdfIn PDF document text
    • http://files.bradleylloydteach.info/uploads/1/3/0/7/130739351/1308313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61027a1f-e5f7-4e11-83a3-9b799167df04.filesusr.com/ugd/b52961_e1e4bbc1e58245ee85d55c1a9e22b249.pdf?index=trueIn PDF document text
    • https://796727c4-29a7-41a1-b4af-0ce2b22d8cc9.filesusr.com/ugd/5f5755_04c4e21ac0fb4723827ef766234dee9b.pdf?index=trueIn PDF document text
    • https://071f7135-7594-462d-a4ff-e0a98698138d.filesusr.com/ugd/6cf0f5_fa3c49d65a6c465fbcc6240a045a4f21.pdf?index=trueIn PDF document text
    • https://b812347d-34b1-46dd-ab44-f813a15eb042.filesusr.com/ugd/941881_177beba548464f7a9e64a8174174d2fd.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/gigarokigamuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4791/9516/files/acupuncture_meridians_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/watch_bride_wars_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/enseanza_aprendizaje_segun_autores.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7256/6936/files/autodesk_360_field_android.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_off0000609e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 5364 bytes
SHA-256: fcb39f195e76921d97e9cb3d4f1def81edfa92638c628533136d24b020e32e06
font_01_sfnt_off0000730b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730B 10104 bytes
SHA-256: 1232c16b0dc80f676314ca36a93ccf54476a49c556433c67059513de83bc605f

Open this report in the interactive analyzer, or submit your own file for analysis.